is a Japanese web manga series written and illustrated by Taizan 5. It was published on Shueisha's web platform Shōnen Jump+ from December 2021 to March 2022, with its chapters collected in two volumes. An original net animation (ONA) adaptation produced by and TBS Television was released from June to August 2025. An anime compilation film titled Takopi's Original Sin: Thank You, See You Tomorrow is set to be released theatrically in Japan in November 2026.
Plot In 2016, Nueinukf, an alien hailing from the Happy Planet, crash-lands on Earth on his mission to spread happiness to others. After evading capture, he comes across Shizuka Kuze, a 9-year-old girl who is bullied at school and only finds solace with her Border Collie, Chappy. Shizuka, noting that he resembles an octopus, names the alien Takopi. Takopi decides to use his planet's Happy Gadgets to help Shizuka, but after seeing her, face scratched and bruised all over as she holds Chappy's leash, Shizuka asks for one of Takopi's gadgets and uses it to take her life. Realizing the gravity of the situation, Takopi uses a Happy Camera to travel back in time, hoping to prevent Shizuka's suicide.
In one of these loops, during a confrontation between Shizuka and her bully Marina Kirarazaka, whose father had an affair with Shizuka's mother, Takopi accidentally hurls the Camera at Marina, breaking it after failing to save Chappy in 101 attempts, killing her and preventing them from reversing time again. Desperate to conceal the crime, Takopi, with help of Shizuka's classmate, Naoki Azuma, buries Marina's body inside one of his gadgets before assuming her identity. The ruse quickly unravels: Takopi's imitation of Marina is unconvincing, and a group of workers soon stumbles upon the hidden corpse. At the same time, Shizuka exploits Naoki's deteriorating mental state—his spiral into paranoia over hiding the crime, his frantic attempts to save her dog, and the crushing weight of being compared to older brother Junya and condemnation after a poor grade. Ultimately, Takopi tries to reason with Shizuka, preventing her from making any more mistakes, but Shizuka knocks him out with a rock.
An unconscious Takopi recalls his previously erased memories; he initially came to Earth in 2022 to spread joy. The first person he ran into however was not Shizuka but Marina who lived in an abusive household. With Takopi's help, Marina's life begins to improve and she starts dating Naoki. However, Naoki leaves Marina for Shizuka, who survives her suicide attempt. When Marina's mother learns about the failed relationship, she attacks Marina. Marina kills her mother in self-defense. After Takopi overhears Marina say that she regrets not "killing" Shizuka in fourth grade, she commits suicide. This failed timeline leads Takopi to plot killing a 9-year-old Shizuka in the past, which caused the erasure of his memories as a violation of Planet Happy's law, making him forget his original plan upon traveling back in time.
Returning to where Marina and Shizuka met, Takopi is consoled by Naoki, who thanks him for their friendship and returns to him his Camera. Months later, Takopi finds Shizuka looking for Chappy, and apologizes for initially causing her pain. He ultimately sacrifices himself to reactivate the Camera, rewinding to 2016 back when Shizuka met Takopi. Afterward, Shizuka and Marina are tearfully reminiscing of Takopi upon noticing Shizuka's sketch of him; Naoki reconciles with Junya and his friends as Takopi wishes them happiness before disappearing. Six years later in 2022, Shizuka and Marina remain best friends growing up together.
Characters
A Happian alien from the Happy Planet who resembles an octopus. Takopi's goal is to spread happiness to others through his various gadgets, though his innocent and simplistic worldview is challenged as he confronts the complex morality and nature of human beings. It is revealed later that Takopi had first met a teenage Marina. Marina revealed how she believed that Shizuka was responsible for all her misfortune and wanted her dead, prompting Takopi to go back in time to fulfill Marina's goal. Takopi lost his memories when he was enacting Marina's wish and forgot his objective, leading him to befriend Shizuka instead. After seeing his actions were doing more harm than good, Takopi sacrificed himself to reset the timeline and give both Shizuka and Marina a better future.
A young girl whom Takopi befriends upon his arrival on Earth. She is the subject of bullying in her school due to her mother's work as a hostess and only finds solace at home with her pet Border Collie Chappy. She commits suicide after Marina had Chappy taken away, only to be saved by Takopi turning back time. As time goes on, she slowly starts to unravel as she feels like she is alone. Eventually, she travels to where her biological father is but learns that he has a new family and decides to kidnap his daughters, which Takopi thwarts after seeing his actions did more harm than good. In the original timeline, Shizuka survives her suicide attempt and moves away. Years later, she returns to her hometown and starts dating Naoki. In the final timeline, Shizuka realizes her situation does not change even if Marina was not in her life, and they end up becoming best friends after subconsciously realizing that they are bonded together through their latent memories of Takopi.
Shizuka's classmate who is her bully, often mocking her family situation. It is later revealed that Marina is a victim of abuse from her mother, due to her father cheating on her with Shizuka's mother. Marina takes out her anger on Shizuka, to the point of assaulting her, believing that if Shizuka were gone, her mother would return to her former self. Later on, Takopi remembers that they met Marina prior to the start of the series and had decided to kill Shizuka by sending himself back in time as that is what Marina wanted. However, Takopi lost his memories and forgot his objective. Takopi then accidentally kills Marina with the Happy Camera and ends up taking her place. In the new timeline, Marina realizes her situation does not change even if Shizuka was not in her life, and they end up becoming best friends as they passively realize that they were bonded together through Takopi.
Shizuka's classmate who tries to support her in any way he can, despite Shizuka repeatedly turning down his help. It is revealed later on that Naoki was being pressured by his mother as she compared him to his older brother Junya who was much more talented than him. Naoki was depressed due to his mother constantly calling him a failure and always expecting him to do just as well as Junya. Naoki eventually learns about Takopi and Marina's death and helps Shizuka by covering it up. Later on, Naoki and Junya reconcile, with Naoki confessing to being involved in Marina's homicide. In the final timeline, Naoki is shown interacting more with his other friends and distancing himself from Shizuka and Marina.
Production
Manga production Author Taizan 5 stated that he originally chose to serialize his work on Shōnen Jump+ because he had read works such as Spy × Family. From there, his editor encouraged him to draw whatever he liked, so he decided to draw a slightly darker version of Doraemon. Using family issues as the theme to suit his preferences, he made it a time loop story in order to develop the story. When asked about how he came up with this worldview, which combines the real-world darkness of bullying and family problems with the unrealistic idea of life forms from outer space, Taizan 5 replied in an interview, "I've always liked suspense novels, and I also like children's topics, so I thought it would be interesting to combine the two worldviews." In an interview with Oricon News about the manga, Taizan 5 explained how he dealt with themes like bullying, domestic violence, and abusive parenting. He went on to explain that he chose to depict scenarios where the issue of blame was not clear and could not be laid solely on one individual.
Anime production The Takopi's Original Sin anime was produced by the studio . It was the first time that the studio has produced an anime TV series. It is a six-episode series written and directed by Shinya Iino. He was responsible in making the anime based on the story of the manga which is emotionally charged and deep.
Direction When Iino and producer Kotaro Sudo were making the anime, they emphasized the necessity of maintaining the original themes and the emotional core of the manga during the production. Iino stressed that he strived to present the issues featured in the manga, such as bullying, neglect, and cruelty, without diminishing their impact, as well as to accentuate the animated version of Takopi's expressive personality. The staff tried to balance Takopi's cheerful personality and the difficult stories of the humans' lives, as well as their problems and possibilities to be saved. Sudo stated that the issue of communication is one of the major themes of the adaptation, as well as the fact that there was a warning about the content before the release of the anime.
During a round table discussion at Anime NYC 2025, director and series composition writer Shinya Iino highlighted some of his objectives in the anime adaptation of Takopi's Original Sin. One of his chief objectives was bringing out the charm and expressiveness of Takopi in anime form, in terms of the actions and dialogues which were not as easy to bring out as in the manga form. Another important objective was ensuring that the structure and atmosphere of the original manga was retained along with the story elements and portrayal of the struggles and quest for happiness of the characters.
In his interview, Iino described how the production crew deliberately refrained from imposing any limits to the scripting and storyboard process so that the staff would be free to choose the best method for adaptation of the manga. According to Sudo, although broadcasting on television could have attracted more viewers, the choice of another format enabled the staff to focus on maintaining the integrity of the original work. The ending of the anime was decided based on the reactions to the early episodes, and ended up being different from what was originally planned.
Art and animation The framework of the story was decided at the initial meeting. As a result of the limited duration of the anime to six episodes, Iino and his crew managed to allocate a different storyboard artist and an episode director for each of the episodes from the start, and every one of the staff members could devote their attention solely to individual episodes. According to Iino, the limited number of episodes allowed the crew to pay greater attention to the quality of individual episodes. As was stated by the producer, Kotaro Sudo, the same amount of time was allocated for the production of the series as is usually spent on a television anime, albeit with less episodes, making it possible for the team to dedicate more effort to each one.
Music Besides taking note of the theme song in the anime, Iino also focused on ensuring that the anime had a suitable soundtrack which would match the mood of Takopi's Original Sin. However, in order to provide contrast against the dark themes in the anime, Iino felt that there should be an upbeat and vibrant portrayal of Takopi through music, especially through use of percussions.
Media Manga Written and illustrated by Taizan 5, Takopi's Original Sin was published on Shueisha's web platform Shōnen Jump+ from December 10, 2021, to March 25, 2022. Shueisha collected its 16 chapters in two volumes, released on March 4 and April 4, 2022.