"PLEASE, DON'T TELL ANYONE..."
This article contains spoilers. Read at your own risk.
| Extra Content |
This is a running list of Extra Content made by Mokumokuren.
Description[]
Mokumokuren posts extra artwork on Twitter and Bluesky with their chapter announcements. Many of them are re-released in the tankobon volumes, so this list is organized chronologically by the chapter part the extra was posted with, as well as the volume that chapter is included in. (Some are posted between chapter releases – these are put into their own section at the bottom.)
If Mokumokuren puts some trivia in the Tweet itself, or if the picture has text in the drawing, then it is summarized in the description. Artwork with no dialogue text or additional information/character interactions is simply summarized as "artwork of [characters]".
Sources are all external links to Twitter (and Bluesky, when available).
Dates are listed in EST.
Volume 1[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 2-1 | About Casual Diner America: Neither the interior nor menu have any American elements. While doing homework together in the diner, Hikaru runs through the verb tenses of "to come". Yoshiki supplies the last conjugation. | September 6, 2021 | |
| 2-2 | Yoshiki was influenced by something he saw online and started responding twice in conversation - for example, saying "I see, I see," which got him the nickname Emil (a character from Herman Hesse's Das Nachtpfauenauge who shares the same verbal quirk). Yoshiki was also called "Kenshiro" after someone said that the moles on his face made the same pattern as the Big Dipper. | September 13, 2021 | |
| 2-3 | Yoshiki's family includes his father, mother, and little sister. He gets along with his sister, who is in her first year of middle school. | September 21, 2021 | |
| 3-1 | The Kibogayama High classmates and their height. | October 4, 2021 | |
| 3-2 | Artwork of their homeroom teacher, Hara: He has a strange way of speaking and doesn't react much. | October 12, 2021 | |
| 3-3 | Artwork of Yoshiki on his days off: He often watches videos of ants, would sleep forever if left to it, feels hungry, can't do without stomach medicine, has growing pains, and is wearing a shirt with the sleeve stretched out by Hikaru. | October 18, 2021 | |
| 4-1 | Hikaru runs 50m in just over 6 seconds. | November 1, 2021 | |
| 4-2 | "Hikaru" is mildly interested to know that his insides feel like marinated raw chicken. | November 9, 2021 | |
| 4-3 | Yoshiki's conflicted over how strange but good it felt when he reached his arm inside. | November 15, 2021 | |
| 5-1 | Nozomi Supermarket in Kibogayama is the only place that sells wasabi mustard. | December 6, 2021 | |
| 5-2 | Yoshiki says Hikaru eats a lot, although Yoshiki himself eats a fair amount too. | December 13, 2021 | |
| 5-3 | "Hikaru" and Yoshiki's favorite foods. "Hikaru": watermelon, sweets, and recently, pork cutlets. Yoshiki: umeboshi. Yoshiki doesn't like sweet things and he often gets stomachaches. His hunger decreases when he's in a growth spurt. | December 20, 2021 | |
| 6-1 | Yoshiki when his hair was cut short for some reason. | January 3, 2022 | |
| 6-2 | Yoshiki, "Hikaru", and Kurebayashi-san's preferences on sweet foods. Yoshiki doesn't like them, "Hikaru" likes all of them, and Kurebayashi has a huge sweet tooth. | January 10, 2022 | |
| 6-3 | Artwork of Yoshiki and "Hikaru". | January 17, 2022 |
Volume 2[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 7-1 | Hikaru thinking about the effectiveness of a burning mosquito coil. | February 15, 2022 | |
| 7-2 | Artwork of Yoshiki and a sleepy "Hikaru". | February 21, 2022 | |
| 7-3 | Asako and Yuuki's worries. Yuuki is worried about having a wide forehead. Asako is worried about her poor sleeping habits on rainy days. | February 28, 2022 | |
| 7-4 | The morning after Chapter 6, "Hikaru" intended to go to school but only got as far as putting on his uniform. | March 7, 2022 | |
| 8-1 | Artwork of Yoshiki holding Mince-aniki. Yoshiki likes animals. | March 28, 2022 | |
| 8-2 | "Hikaru" eats a delicious (but piping hot) Takoyaki. | April 4, 2022 | |
| 8-3 | Artwork of Yoshiki and "Hikaru" with tinted tongues due to shaved ice. | April 11, 2022 | |
| 9-1 | Artwork of Hikaru's back view on his fateful day. | April 25, 2022 | |
| 9-2 | Yoshiki looks like a sumo wrestler with his oversized puffer jacket. | May 2, 2022 | |
| 9-3 | Five of Yoshiki's shirts. "In the boonies like this, being stylish is just..."
1) A polo shirt his mom bought him at Mion Mall. Three villagers will be wearing a polo shirt with this exact pattern on any given day. |
May 9, 2022 | |
| 9-4 | "Hikaru" points out all of Yoshiki's visible moles: Four on his face (the fourth is hidden on the inside of his lip line), two on his neck (different in size), one on each arm. He assumes there has to be about 10 more. He once saw Yoshiki searching "how to remove moles" on his phone. | May 16, 2022 | |
| 10-1 | Artwork of Hikaru. | June 6, 2022 | |
| 10-2 | Yoshiki asks Kaoru for one of her bandanas. Kaoru agrees but says that hers will all be small on him. | June 13, 2022 | |
| 10-3 | Yuuki is part of the Home Economics Club and Asako is part of the Girls' Volleyball Club. | June 20, 2022 | |
| 10-4 | "Hikaru" trying to scoop a thin layer off the top of his pudding. It got difficult around the middle part. | June 27, 2022 | |
| 11-1 | Working Cat is a popular social media character depicted in various industries. | July 4, 2022 | |
| 11-2 | Yoshiki smells like flowers after using rose-scented bath salts. | July 11, 2022 | |
| 11-3 | Yoshiki on Kubitachi's good points: Food is delicious, you can find insects and wild animals. He thinks more stuff might be good for people suited to it. | July 18, 2022 | |
| 11-4 | As a young child, Yoshiki's mom used to cut his hair. As he grew up, he started disliking it, so his bangs have grown longer. | July 25, 2022 |
Volume 3[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 12-1 | Artwork of Tanaka. | September 5, 2022 | |
| 12-2 | Wet Yoshiki and "Hikaru" after the shower fight. | September 19, 2022 | |
| 12-3 | "Hikaru" can heal a wound by just thinking about it, but since he doesn't feel pain, it's hard to think about it in the first place. Wounds that threaten the body's life preservation heal quickly. | October 3, 2022 | |
| 13-1 | 4-koma based on the Volume 2 extra. "Hikaru", after realizing a baby bird will turn into the same kind as it's parents, laughs about the thought of Yoshiki marrying and creating 4 mini Yoshikis. | October 10, 2022 | |
| 13-2 | When singing in the choir, Yoshiki's voice is extremely faint. | October 24, 2022 | |
| 13-3 | Artwork of "Hikaru". | November 7, 2022 | |
| 14-1 | Hikaru asks Yoshiki how long he'll keep playing the same game. Meanwhile, Yoshiki refuses to let any Pikmin die, resetting every time just to make sure everyone makes it alive. | November 21, 2022 | |
| 14-2 | Comic about Yuuki possibly being more delicate than Asako. Asako doesn't believe so, as Yuuki's boldness shows when she dries her hands by aggressively shaking them in the air instead of using a towel, making mud pies in the dirt or weeding straight with her hands. Yuuki realizes she's kind of rough, even though she's careful when cooking, and Asako says it's okay as it's pretty manly. | December 5, 2022 | |
| 14-3 | Artwork of "Hikaru" contemplating a sparkler. | December 19, 2022 | |
| 14-4 | New Year's artwork of Yoshiki looking at a mandarin orange, symbolizing good luck. | January 3, 2023 | |
| 15-1 | Artwork of "Hikaru". | January 16, 2023 | |
| 15-2 | Yoshiki has an appetite even when he's depressed. | January 30, 2023 | |
| 15-3 | Hikaru is popular and gets a lot of chocolates on Valentine's Day, although "Hikaru" doesn't really understand the culture of it. Yoshiki keeps more to himself so he only gets gifts from Asako and Yuuki. They know Yoshiki doesn't like sweets, so Yuuki gives him rice crackers and Asako gives him cheeses. | February 13, 2023 | |
| 16-1 | Asako and Yuuki ask the readers to submit questions for the volume 3 tankobon. | March 6, 2023 | |
| 16-2 | Artwork of Yoshiki. | March 20, 2023 | |
| 16-3 | Artwork of "Hikaru". | April 3, 2023 | |
| 16-4 | Yoshiki wonders if everything's gone back to normal. | April 17, 2023 |
Volume 4[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 17-1 | After he cleaned "Hikaru"'s bloodied uniform shirt, Yoshiki realizes there's still a hole in it from the knife, so he just throws it away. | May 2, 2023 | |
| 17-2 | Clay sculptures that Yoshiki and Hikaru made as children. Mokumokuren also corrects a typo in the first page of the chapter:「音」(sound) should be「昔」(a long time ago). | May 15, 2023 | |
| 17-3 | Yoshiki is normally well-behaved, so he doesn't react well to being scolded. | May 29, 2023 | |
| 18-1 | "Hikaru" complains it's hard for him to read lots of small print. | June 5, 2023 | |
| 18-2 | Yoshiki raising a baby bear. He'll take responsibility for it. | June 12, 2023 | |
| 18-3 | "Hikaru" considers the concept of joint liability. | June 19, 2023 | |
| 18-4 | As a child, Hikaru got horribly scolded for forgetting his homework. The class laughed at him when he said he did his homework but just lost the paper. It was actually in Yoshiki's backpack the whole time. | June 26, 2023 | |
| 19-1 | Tanaka's hamster contains the soul of a human child, so it can sense impurities. But it still has the consciousness of a hamster. | July 3, 2023 | |
| 19-2 | Yuuki is shocked by a photo of a younger Maki with hair. | July 10, 2023 | |
| 19-3 | Yoshiki feels frightened thinking about the nude man who died in the school courtyard. | July 17, 2023 | |
| 19-4 | When "Hikaru" ripped out his insides, he put them into a bone (his xiphoid process). | July 24, 2023 | |
| 20-1 | Yoshiki had a lot of trouble carrying "Hikaru" to Kurebayashi's car. | August 7, 2023 | |
| 20-2 | Kurebayashi's mother passed away when she was young, so she relies on her mother-in-law. She has gone through a lot of hardship. | August 14, 2023 | |
| 20-3 | "Hikaru" looks at a baby chick and ponders life. | August 21, 2023 | |
| 20-4 | Tanaka doesn't have spiritual abilities, so he needs physical signs to detect them. He's almost 190 cm tall. | August 28, 2023 | |
| 21-1 | "Hikaru" has limited vocabulary and says "like..." when he's thinking. But it means something different than what humans mean by "like". Humans can't intrinsically understand it the same way we can't understand why dogs dig holes. | September 11, 2023 | |
| 21-2 | A list of the Kubitachi and Kibogayama mountains. Most local children have been made to climb Mount Tenban. | September 18, 2023 | |
| 21-3 | "Hikaru" prefers colorful clothes. | September 25, 2023 | |
| 21-4 | Artwork of "Hikaru". | October 2, 2023 |
Volume 5[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 22-1 | Artwork of Yoshiki. | November 6, 2023 | |
| 22-2 | A scenario where "Hikaru" started talking before his head is re-attached. He suggests getting a job at a haunted house. | November 20, 2023 | |
| 22-3 | After all that's happened, Yoshiki is not easily surprised by things anymore. | December 4, 2023 | |
| 23-1 | Kurebayashi had considered slapping Yoshiki to get him to come back to himself, but she thought that was too far. | December 18, 2023 | |
| 23-2 | Yoshiki has a stressful dream where "Hikaru"'s head pops back off. | December 25, 2023 | |
| 23-3 | Yoshiki theorizes about Nounuki-sama and the villages' history. An idle "Hikaru" finds him smart and wonders if he should try thinking harder too. | January 1, 2024 | |
| 23-4 | Artwork of Yoshiki. | January 8, 2024 | |
| 24-1 | If "Hikaru" hadn't weakened himself in Chapter 16, Yoshiki would not have survived in Chapter 24. | January 22, 2024 | |
| 24-2 | Indou Kouhei used to play tag with Yoshiki and Hikaru. He would stick boogers on them if he caught them. Yoshiki took to Kouhei more than his own father. | January 29, 2024 | |
| 24-3 | "Hikaru" has a poor sense of personal space. | February 5, 2024 | |
| 24-4 | Hikaru once cried after swallowing watermelon seeds. Every time Hikaru cried around him, Yoshiki didn't notice because he was sobbing even harder. | February 12, 2024 | |
| 25-1 | Yoshiki resembles his mother more than his father. Yoshiki googles how to remove the moles he inherited from Toshinori. Toshinori is troubled by how much they bother Yoshiki. | March 4, 2024 | |
| 25-2 | Toshinori's father pushed him to go to university in Tokyo. There, he met Satoko, a hairdresser. Toshinori was so clumsy that she worried if he'd be okay. Before she knew it, they were married. | March 11, 2024 | |
| 25-3 | A scenario where "Hikaru" is a glutton. He eats snacks while crying over the thought of being lonely. | March 18, 2024 | |
| 26-1 | Yoshiki brought back a larva plushie for Kaoru as a souvenir, but she doesn't really like it. | April 8, 2024 | |
| 26-2 | Artwork of "Hikaru". | April 15, 2024 |
Volume 6[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 27-1 | Tanaka's pants got wet when he confronted Yoshiki and "Hikaru" at the beach. | May 13, 2024 | |
| 27-2 | How to make a "Hikaru" doll. | May 20, 2024 | |
| 27-3 | "Hikaru" is surprised to see Yoshiki suddenly cry on the train. | May 27, 2024 | |
| 27-4 | Yoshiki doesn't want to deflate his pool floatie, so he just stuffs it into his bag instead. | June 3, 2024 | |
| 28-1 | Colored page from the chapter. | June 4, 2024 | |
| 28-2 | "Hikaru" eats quickly. | July 1, 2024 | |
| 28-3 | Yoshiki generally dislikes sweet things. He likes soda and ice pops. He dislikes fresh cream and chocolate. | July 8, 2024 | |
| 29-1 | Yoshiki and "Hikaru" notice that Maki's hair is growing out. | July 29, 2024 | |
| 29-2 | "Hikaru" explains that guardian deities take a bit of life force from the humans they protect. | August 5, 2024 | |
| 29-3 | "Hikaru" hates if impurities get close to Yoshiki, but doesn't care if humans do. | August 12, 2024 | |
| 30-1 | Maki shows "Hikaru" a picture of his older brother. | September 9, 2024 | |
| 30-2 | Hoko dolls have been made since the Heian Period. | September 9, 2024 | |
| 30-3 | Artwork of Asako and Yuuki. | September 16, 2024 | |
| 31-1 | Yoshiki presents a katashiro doll. It serves as a substitute for a divine spirit or a person. | October 14, 2024 | |
| 31-2 | Yoshiki knows that serows are in the same family as cows. He wonders whether a serow impurity would still go through shedding season. | October 21, 2024 | |
| 31-3 | Artwork of "Hikaru". | October 28, 2024 |
Volume 7[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 32-1 | Tanaka wears silly celebration glasses. Takeda asks if he's a street vendor. | December 2, 2024 | Twitter Bluesky |
| 32-2 | Asako buys clothes at Mion Shopping Center. She's more interested in fashion than Yuuki. | December 9, 2024 | Twitter Bluesky |
| 32-3 | "Hikaru" is asked where impurities go when he consumes them. He doesn't know - you'd have to enter to find out. | December 16, 2024 | Twitter Bluesky |
| 33-1 | Asako asks Tanaka why he only likes sweets. Tanaka answers that his tastebuds are dead, so the only things that taste good to him are sweets and toothpaste. | January 13, 2025 | Twitter Bluesky |
| 33-2 | Since spiritual senses are inherited, it's possible that everyone who can naturally sense them are descendants of the same ancestor. When the impurity is the one initiating contact, even normal people like Yoshiki can sense them. | January 20, 2025 | Twitter Bluesky |
| 33-3 | The limbs surrounding the holes are statue-like, very solid with the temperature of stone. They look like they could be both men's or women's legs. | January 27, 2025 | Twitter Bluesky |
| 34-1 | "Hikaru" finds a summer darter dragonfly. | February 17, 2025 | Twitter Bluesky |
| 34-2 | Tanaka has no spiritual abilities, but he can communicate to impurities using a special vocalization method. | February 24, 2025 | Twitter Bluesky |
| 34-3 | Artwork of "Hikaru". | March 3, 2025 | Twitter Bluesky |
| 35-1 | Yoshiki didn't put the knife he stabbed "Hikaru" with back in the kitchen. He rolled it up in newspaper and hid it under his bed. | March 24, 2025 | Twitter Bluesky |
| 35-2 | Artwork of Tanaka and Asako. | March 31, 2025 | Twitter Bluesky |
| 35-3 | Maki mentally apologizes to his older brother for not believing his warnings about the serow offerings. His brother once suggested that if a ghost appears, Maki should just strip and spray Febreze. | April 7, 2025 | Twitter Bluesky |
| 35-4 | Artwork of Yoshiki. | April 14, 2025 | Twitter Bluesky |
| 36-1 | Artwork of "Hikaru". | May 5, 2025 | Twitter Bluesky |
| 36-1 | Full double-page spread from the chapter. | May 6, 2025 | Twitter Bluesky |
| 36-2 | Artwork of Tanaka. | May 12, 2025 | Twitter Bluesky |
| 36-3 | Yoshiki and Asako seem to be opposites, but they are similar in that they're both strong-minded and serious. Yoshiki prioritizes logic while Asako prioritizes emotion. Because of Asako's ability to hear spirits, she has a more flexible personality that isn't bound by conventional ways of thinking. She can make quick decisions and be courageous when the situation calls for it, but she is also prone to acting recklessly. Had Asako been in Yoshiki's situation, she would've asked if "Hikaru" wasn't the real Hikaru immediately instead of waiting six months like Yoshiki did, which would have led to her death. | May 19, 2025 | Twitter Bluesky |
| 36-3 | Colored collage of panels from Chapter 36. | May 22, 2025 | Twitter Bluesky |
Volume 8[]
| Chapter | Content | Date | Source |
|---|---|---|---|
| 37-1 | Color spread of Hikaru, Maki, Asako, Yuuki, and Yoshiki. It takes place in the spring before Hikaru's death. The other four were in the same middle school, but Maki joined in high school, so they had only just started to become friends. Additionally, a 4-panel comic of "Hikaru". He gets really into movies. While he watches a movie with Yoshiki, "Hikaru" calls a character weak and claims he would've won the fight already if it were him. Yoshiki notes that "Hikaru" is competing with a kaiju. While Indou Hikaru was alive, he didn't have this deep of an interest in movies. |
June 30, 2025 | Twitter Bluesky Bluesky (cont'd) |
| 37-2 | Yoshiki coughs after calling "Hikaru"'s name. He isn't used to shouting. | July 7, 2025 | Twitter Bluesky |
| 37-2 | Timelapse video of Mokumokuren drawing one of the pages from the chapter. | July 7, 2025 | |
| 37-3 | Yoshiki puts a huge amount of effort into drawing "Hikaru"'s insides, which is difficult for him since it's something nonhuman he doesn't fully understand. "Hikaru" ends up laughing because he doesn't think the drawing looks like him at all. | July 14, 2025 | Twitter Bluesky |
| 37-4 | "Hikaru"'s insides (true form) can recall memory, so some amount of memories and personality would be carried on even after leaving the body. | July 21, 2025 | Twitter Bluesky |
| 38-1 | Kurebayashi insists she's just a normal housewife. | August 4, 2025 | Twitter Bluesky |
| 38-2 | Asako has actually been mad at Yoshiki since around Volume 6. | August 11, 2025 | |
| 38-3 | Artwork of Yoshiki and Asako. | August 18, 2025 | Twitter Bluesky |
| 38-4 | Tanaka is virtually unable to see anything with the naked eye, but he can see when he's wearing a special pair of glasses. When Takeda asked him about it, he explained that he lost his sight after suffering a spiritual injury a long time ago. | August 25, 2025 | Twitter Bluesky |
| 41-1 | Artwork of Yoshiki after cutting his bangs. | November 4, 2025 | Twitter Bluesky |
| 41-2 | Artwork of Kurebayashi and Tanaka. | November 11, 2025 | Twitter Bluesky |
Between Chapters[]
| Content | Date | Source |
|---|---|---|
| Artwork of Yoshiki and "Hikaru". Mokumokuren announces the serialization will start on the following day. | August 30, 2021 | |
| Artwork of "Hikaru": Profile pictures in blue and red. Mokumokuren used the blue profile pic for a long time. | September 12, 2021 | |
| Artwork of "Hikaru" and Yoshiki. | September 30, 2021 | |
| Artwork of "Hikaru". | October 5, 2021 | |
| Artwork of "Hikaru". | October 12, 2021 | |
| Artwork of "Hikaru" biting Yoshiki's finger. | October 15, 2021 | |
| Artwork of "Hikaru". | October 23, 2021 | |
| Halloween comic of Yoshiki and "Hikaru". "Hikaru" wants to experience Halloween in Shibuya, while Yoshiki refuses, as he's afraid of crowds, and that event looks like a "sea of flesh". "Hikaru" still wants to go at least once, dressed as a zombie as he thinks it'd be fitting. | October 31, 2021 | |
| Artwork of Yoshiki and "Hikaru". Mokumokuren announces a Vomic (Voice comic) will be released on Youtube in 3 days. | November 18, 2021 | |
| Artwork of Yoshiki. | November 28, 2021 | |
| Artwork of Yoshiki and "Hikaru"'s hands. Mokumokuren announces the release of the third voice comic. | December 4, 2021 | |
| Artwork of Yoshiki being choked by "Hikaru"'s hands. | December 4, 2021 | |
| Artwork of Yoshiki and "Hikaru"'s eyes. Mokumokuren explains the designs were based on a (weak) vampire and a fox, accordingly. | December 8, 2021 | |
| Parody comic of Chapter 3. Mokumokuren announces the release of the fourth voice comic together with a temporary pause, reminding people to check episodes 1 to 4. | December 11, 2021 | |
| Artwork of Hikaru. | December 12, 2021 | |
| Artwork of Yoshiki and "Hikaru" for Christmas. | December 25, 2021 | |
| Yoshiki could evenly match with "Hikaru" in arm wrestling, but he loses every time as he gives up quickly. | December 30, 2021 |
| Content | Date | Source |
|---|---|---|
| Animation of "Hikaru" smiling. | February 8, 2022 |
| Content | Date | Source |
|---|---|---|
| Artwork of Yoshiki. Mokumokuren announces they will try to return to a weekly release schedule soon. | January 23, 2023 | |
| Artwork of Yoshiki and "Hikaru". | February 7, 2023 | |
| Artwork of Yoshiki. | February 21, 2023 | |
| Yoshiki gives Asako a return gift for White Day, but "Hikaru" isn't aware of the holiday. | March 13, 2023 | |
| Indou Hikaru's birthday art. | March 19, 2023 | |
| Artwork of Yoshiki. | March 29, 2023 | |
| Artwork of Yoshiki. | April 10, 2023 | |
| Yoshiki's birthday art. | April 19, 2023 | |
| Artwork of Hikaru. (Or "Hikaru", but his eyes are closed, so it's ambiguous.) | April 24, 2023 | |
| "Hikaru" is shocked and upset that Golden Week is over. | May 8, 2023 | |
| "Hikaru" doesn't experience desire for food, sex, or sleep. | May 22, 2023 | |
| For "Hikaru", Yoshiki reaching into his chest satisfied a different desire than sexual arousal. "Hikaru" is shocked that Yoshiki doesn't experience the desire to take things into his body. | May 23, 2023 | |
| Asako has her hair braided nicely for the Volume 3 release. "Hikaru" laughs that Yoshiki's hair is usually messed up, but Maki thinks he looks cool. | June 1, 2023 | |
| Artwork of Yoshiki and "Hikaru". | June 28, 2023 | |
| Artwork of "Hikaru". | July 14, 2023 | |
| Mokumokuren tried to draw Yoshiki with untrimmed eyebrows, but doesn't feel they were very successful. | July 24, 2023 | |
| Artwork of "Hikaru" and Yoshiki. | July 31, 2023 | |
| Coloring information for "Hikaru", Yoshiki, Asako, Maki, and Yuuki. | August 1, 2023 | |
| Artwork of Yoshiki. | September 4, 2023 | |
| Artwork of "Hikaru". | September 8, 2023 | |
| Yoshiki's mom has a family dog that he finds quite heavy. | October 9, 2023 | |
| Artwork of Tanaka. | October 16, 2023 | |
| Artwork of Yoshiki and "Hikaru". | October 23, 2023 | |
| "Hikaru" cannot understand romantic feelings or the value of human life. Building relationships while existing outside of conventional values is something Mokumokuren keeps in mind while they create the manga. | October 30, 2023 | |
| Being touched by "Hikaru"'s insides feels good because it releases β-endorphin, a pain-relieving hormone. | November 13, 2023 | |
| Artwork of "Hikaru". | November 27, 2023 | |
| Artwork of Yoshiki, Kurebayashi, and Iori for the Volume 4 release. | December 3, 2023 | |
| Artwork of Yoshiki. | December 11, 2023 | |
| Artwork of Asako. | December 17, 2023 | |
| Yoshiki and Yuuki wearing Kibogayama High's winter uniform. | December 19, 2023 | |
| Artwork of "Hikaru". | December 28, 2023 | |
| Artwork of "Hikaru" for New Year's. | December 31, 2023 |
| Content | Date | Source |
|---|---|---|
| 8-bit artwork of Yoshiki, "Hikaru", Asako, Yuuki, and Maki. | January 11, 2024 | |
| Artwork of Yoshiki and "Hikaru". | January 15, 2024 | |
| Yuuki stays up late trying to finish her summer homework. Speed with completing their summer assignments: Asako (fastest), Yoshiki, Maki, Hikaru, Yuuki (slowest). | February 8, 2024 | |
| Artwork of "Hikaru". | February 19, 2024 | |
| Yoshiki dislikes the color orange, because Hikaru was wearing an orange jacket when Yoshiki found him in the mountains. | February 23, 2024 | |
| Yoshiki considers cutting his bangs. | February 26, 2024 | |
| Tsujinaka family tree. | March 6, 2024 | |
| Indou Hikaru's birthday art. | March 19, 2024 | |
| Artwork of "Hikaru". | March 25, 2024 | |
| Yoshiki's friends each name something about him they find annoying. | April 1, 2024 | |
| Yoshiki thinks that "Hikaru" somewhat resembles a wild animal. | April 14, 2024 | |
| "Hikaru" is surprised by how smelly human bodies can get. | April 14, 2024 | |
| Yoshiki's birthday art. | April 19, 2024 | |
| "Hikaru"'s words carry some power of compulsion that he usually uses on impurities. He uses it on Yoshiki (who's ignoring him) so he can ask if Saga actually floats. (Possibly referring to the "floating" Ouo Shrine torii gates in Saga, Japan that are partially submerged in water during high tide.) | April 22, 2024 | |
| "Hikaru" is rather pale. He automatically heals sunburns. | April 29, 2024 | |
| At first, "Hikaru" didn't understand how much force to use in daily activities. He often injured himself accidentally and then self-healed. | May 6, 2024 | |
| Artwork of Asako. | May 9, 2024 | |
| Artwork of Yoshiki. | May 22, 2024 | |
| Animated video announcing the anime adaptation. | May 23, 2024 | |
| Artwork of Yoshiki for the volume 5 release. | June 3, 2024 | |
| Mokumokuren summarizes the history of Kubitachi. See Historical Timeline for summary. | June 10, 2024 | |
| Artwork of "Hikaru". | June 17, 2024 | |
| Four possible "bad ends" Yoshiki could've encountered with "Hikaru" if he had made different choices. | June 21, 2024 | |
| Artwork of "Hikaru" and Yoshiki. | July 23, 2024 | |
| Artwork of "Hikaru". | August 19, 2024 | |
| Artwork of "Hikaru". | August 26, 2024 | |
| Artwork of Yoshiki wearing Mokumokuren's proposed T-shirt design for merch. | September 12, 2024 | |
| A Ophiocordyceps sinensis with "Hikaru"'s insides spilling out of it. | September 12, 2024 | |
| Yoshiki is amazed by a cane spider. Kaoru is horrified by it. | September 23, 2024 | |
| Artwork of Yoshiki and "Hikaru" in an 8-bit video game style. | September 30, 2024 | |
| Artwork of Asako, Yoshiki, and "Hikaru" for Halloween. | October 7, 2024 | |
| Artwork of Tanaka saying "you'll probably die". | October 10, 2024 | |
| Artwork of "Hikaru" and Yoshiki. | October 23, 2024 | Bluesky |
| Artwork of "Hikaru" for the countdown to the first PV release for the anime. | November 7, 2024 | Twitter Bluesky |
| Artwork of "Hikaru". | November 8, 2024 | |
| Artwork of Yoshiki. | November 18, 2024 | Twitter Bluesky |
| A description of some of the mountains, Tenbanzan and Nisayama. | December 8, 2024 | |
| Yoshiki, "Hikaru", and Kaoru eat cake together for Christmas. | December 23, 2024 | Twitter Bluesky |
| "Hikaru" has crooked teeth. During character design stages, they ended up drawing him as an oni. Yoshiki doesn't trim his eyebrows because he tried once and it didn't work well. He is also concerned about nose hairs sticking out. | December 30, 2024 | Bluesky |
| Artwork of Yoshiki for New Year's. | December 30, 2024 | Twitter Bluesky |
| Content | Date | Source |
|---|---|---|
| A map of all five towns, with labeled houses and significant locations/events. See Map:Kibogayama Region for summary. | January 6, 2025 | Twitter Bluesky |
| Mokumokuren gives a rough summary of the main plot points until ~Chapter 33. | January 14, 2025 | Twitter Bluesky |
| Artwork of Tanaka. | February 3, 2025 | Twitter Bluesky |
| "Hikaru" looks like Hikaru when Mokumokuren draws him in winter clothes, so they won't be doing that anymore. | February 15, 2025 | Twitter Blueksy |
| Animated AmberDraw of "Hikaru"'s insides. | March 4, 2025 | Twitter Bluesky |
| Toshinori has a large physique. If Yoshiki worked out, he would be very strong and reliable, too. | March 17, 2025 | Twitter Bluesky |
| Indou Hikaru's birthday art. | March 20, 2025 | Twitter Bluesky |
| Yoshiki when he gets dragged along by family members on shopping trips. | April 3, 2025 | Twitter Bluesky |
| Trivia about two students at Kibogayama High. Saito-san is a girl in the track and field club who Hikaru liked while he was alive. Hikaru was going to talk to her, but backed off when he overheard her say "No one skips club activities, haha" (Hikaru frequently skips his clubs). Takeshita once challenged Asako to arm-wrestling and lost. Girls call him good-looking. He's a bit of an idiot, but they don't know because he has almost no female friends. |
April 9, 2025 | Twitter Bluesky |
| Yoshiki's birthday art. | April 20, 2025 | Twitter Bluesky |
| The serow impurities that protect Maki's family has been in Udekari since before the hole opened. They can appear individually or in groups. The impurities that are coming out of the hole are in a state of "competing for territory" with the serows. | April 22, 2025 | Twitter Bluesky |
| Artwork of "Hikaru". | April 28, 2025 | Twitter Bluesky |
| Animation of "Hikaru", re-posted on Bluesky from the original Twitter post on February 8, 2022. | May 14, 2025 | Bluesky |
| Asako compliments Yoshiki's attention to detail when he draws insects. He draws a highly detailed, unflattering picture of Asako that she and Maki find hilarious. "Hikaru" then draws Yoshiki at an incredibly low level of detail, with a single hair to represent his growing "beard". | May 26, 2025 | Twitter Blueksy |
| Yoshiki doesn't have particularly strong insight or spiritual sensitivity. So if he hadn't seen Hikaru's corpse, he probably wouldn't have noticed that he'd been replaced by "Hikaru". He would have noticed that he was slightly different, but would've attributed it to hitting his head in the mountains. | June 16, 2025 | Twitter Bluesky |
| Yuuki and Maki both struggle to get the lid off a jar, but Yoshiki opens it and makes an insanelt intense face while he does it. Maki attributes it to all the pent-up anger Yoshiki must keep inside. | June 23, 2025 | Twitter Bluesky |
| Sample artwork of "Hikaru" and Yoshiki for Season 1's Blu-ray/DVD release. | June 27, 2025 | Bluesky |
| Artwork of "Hikaru" and Yoshiki for the anime release. | June 29, 2025 | Twitter Bluesky |
| A re-posted 4-panel comic of Yoshiki and "Hikaru". Yoshiki checks "Hikaru"'s radial pulse and is shocked to find that there isn't one. "Hikaru" explains he was so excited that he forgot to make his heart beat. | July 1, 2025 | Twitter Bluesky |
| A re-posted 4-panel comic of Yoshiki and "Hikaru". "Hikaru" likes studying, but he doesn't understand the material well. Yoshiki tries teaching him but "Hikaru" gets distracted and stops listening, so Yoshiki throws the book at his face. | July 2, 2024 | Bluesky |
| Artwork of Asako and Tanaka promoting the anime release. | July 3, 2025 | |
| Artwork of "Hikaru" promoting the anime release. | July 4-5, 2025 | Twitter Bluesky |
| Re-draw of old artwork of "Hikaru" for Episode 2 of the anime. | July 11, 2025 | Twitter Bluesky |
| Artwork of Yoshiki comparing the rhythm of Nishidaya's chattering to a rhythm tap game. | July 12, 2025 (Twitter) July 30, 2025 (Bluesky) |
Twitter Bluesky |
| Color script of the opening theme song, which Mokumokuren created with help of a friend. A part quotes Herman Hesse's "Youth Is Beautiful". | July 12, 2025 | |
| Artwork of Asako and "Hikaru" promoting the anime's availability on streaming services. | July 16, 2025 | |
| Artwork of "Hikaru" for episode 3 of the anime. | July 19, 2025 (twitter) July 30, 2025 (Bluesky) |
Twitter Bluesky |
| Artwork of Asako and Yuuki for episode 4 of the anime. | July 26, 2025 (Twitter) July 30, 2025 (Bluesky) |
Twitter Bluesky |
| Artwork of Yoshiki and Kaoru noting the anime's change in availability on ABEMA. | July 28, 2025 | |
| Artwork of the state of Yoshiki's bruise as of chapter 37. | July 28, 2025 (Twitter) July 30, 2025 (Bluesky) |
Twitter Bluesky |
| Artwork of the curvy tree and a Master x Master character. Because Nisayama is a restricted area, the trees aren't maintained and there are many twisted-looking ones. The character "Ling Xiang" appears in Master x Master and was Hikaru's emotional support during his life. | July 30, 2025 | |
| Artwork of wig ghost and the pristine-looking Yoshiki from "Hikaru" and Maki's imagination, for the release of Episode 5. | August 2, 2025 | |
| Artwork of Tanaka and Yoshiki announcing the anime's availability on ABEMA. | August 3, 2025 | |
| Artwork of Takeda holding Tanaka back while he destroys the shrine. | August 7, 2025 | |
| Artwork of Yuuki and "Hikaru" to announce the anime's temporary free availability on a streaming service. | August 9, 2025 | Twitter Bluesky |
| Artwork of Asako and Yoshiki to announce the anime's temporary free availability on ABEMA. | August 10, 2025 | |
| Artwork of Yoshiki and Mince-aniki to announce the anime's temporary free availability on ABEMA. | August 13, 2025 | |
| Artwork of Yoshiki for episode 6 of the anime. | August 16, 2025 | |
| Artwork of "Hikaru" announcing the anime's availability on ABEMA. | August 17, 2025 | |
| Artwork of "Hikaru" for episode 7 of the anime. | August 19, 2025 | |
| Artwork of Yoshiki and Mince-aniki to announce a reprint of the manga. | August 21, 2025 | |
| Artwork of Yoshiki and "Hikaru" to announce the anime's temporary free availability on ABEMA + the start of the Mystery Solving Arc. | August 21, 2025 (Twitter) August 22, 2025 (Bluesky) |
Twitter Bluesky |
| Artwork of Yoshiki, Matsuura, Tanaka, and his hamster for episode 8 of the anime. Yoshiki doesn't like being scolded. | August 23, 2025 | |
| Artwork of "Hikaru" and Mince-aniki to announce the anime's streaming services. | August 25, 2025 |