Takopi's Original Sin

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 tankōbon volumes. Plot Nnu-Anu-Kf is a Happian—an alien who resembles an octopus, who traveled from the Happy Planet in order to spread happiness to others. After crash-landing on Earth and escaping federal authorities, he comes across Shizuka, a 9-year-old girl who is bullied relentlessly by her classmate Marina and only finds solace with her dog 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 Marina intentionally gets bitten by Chappy in order for him to be taken in by animal control, Shizuka uses one of Takopi's gadgets to commit suicide. Realizing the gravity of the situation, Takopi uses another gadget to travel back in time, hoping that he can improve Shizuka's life. Publication Written and illustrated by , Takopi's Original Sin was published on Shueisha's web platform Shōnen Jump+ from December 10, 2021, to March 25, 2022. Shueisha collected its sixteen chapters in two tankōbon volumes, released on March 4 and April 4, 2022. Shueisha's Manga Plus service published chapters of the series in English simultaneously with their Japanese release. On February 3, 2023, Viz Media announced that they licensed the manga for English publication.