Takopi's Original Sin

Takopi's Original Sin

Company type	Manga series, Original net animation
Industry	Entertainment
Founded	December 10, 2021 (2021-12-10)
Founder	Taizan 5
Headquarters	Japan
Products	Manga, Anime ONA

is a Japanese web manga created by , serialized on Shueisha's Shōnen Jump+ platform from December 2021 through March 2022, and compiled into two volumes. An original net animation (ONA) adaptation produced by  alongside TBS Television was broadcast from June to August 2025.

Plot

In 2016, an extraterrestrial named Nueinukf from the Happy Planet crash-lands on Earth with the mission of spreading joy. After evading capture, the alien encounters Shizuka Kuze, a nine-year-old girl who endures bullying and finds solace only in her pet dog Chappy. Shizuka dubs the alien Takopi due to its octopus-like appearance. Utilizing its Happy Gadgets, Takopi attempts to assist her; however, when Shizuka uses one of these devices in a suicide attempt, Takopi travels back in time to alter her fate.

During one time loop, Takopi unintentionally causes the death of Marina Kirarazaka, Shizuka's tormentor, using the Happy Camera gadget. The device becomes damaged, eliminating the possibility of further time travel. To conceal Marina's death, Takopi and Naoki Azuma, a classmate of Shizuka's, hide her body inside a gadget while Takopi assumes Marina’s identity. Their ruse collapses when workers discover the remains. Concurrently, Shizuka manipulates Naoki’s growing paranoia about the incident alongside his personal difficulties with his dog and family life.

As the loops continue, the story unveils the troubled histories of the characters—highlighting neglect, abuse, and loneliness as driving forces behind their desperate behaviors.

Characters

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An alien from the Happy Planet known as a Happian, bearing an octopus-like form. Takopi’s goal is to spread happiness through various gadgets but struggles to grasp human complexities. Initially encountering a teenage Marina who resented Shizuka and wished harm upon her, Takopi traveled back in time to fulfill this desire but lost its memories during the process and instead befriended Shizuka. Upon realizing its unintended consequences, Takopi sacrifices itself to reset events for an improved future for both girls.

A young girl subjected to bullying because of her mother’s occupation as a hostess; she finds comfort only in her dog Chappy. After Marina causes Chappy’s removal from her life, Shizuka attempts suicide but is saved when Takopi reverses time. She faces feelings of isolation and later attempts to interfere with her biological father’s new family—an act prevented by Takopi. In the altered timeline, Shizuka and Marina develop a close friendship through their mutual connection with Takopi.

A classmate and bully of Shizuka who mocks her family background. Marina endures abuse from her mother due to her father’s affair with Shizuka’s mother. Takopi recalls meeting Marina prior to the main events and originally intended to kill Shizuka at Marina’s request but lost its memory. Accidentally killing Marina later on, Takopi assumes her identity. In the revised timeline, Marina and Shizuka become best friends through their shared link with Takopi.

A classmate who supports Shizuka despite social rejection. Naoki faces pressure from his mother who unfavorably compares him to his accomplished older brother Junya, leading to depression. After discovering the deaths of Takopi and Marina, he aids in covering them up. Eventually reconciling with Junya, Naoki confesses to killing Marina under Shizuka’s encouragement. In the new timeline, Naoki becomes more socially active with other peers while distancing himself from both Shizuka and Marina.

Manga

Created and illustrated by , Takopi's Original Sin was serialized on Shueisha's digital platform Shōnen Jump+ from December 10, 2021, until March 25, 2022. The publisher compiled its sixteen chapters into two separate volumes, which were made available on March 4 and April 4, 2022.

Simultaneous English releases of the chapters were provided by Shueisha's Manga Plus service alongside the Japanese publication. In February 2023, Viz Media acquired the rights for English distribution of the manga, subsequently issuing the entire series as a single volume on November 21 of that year.

Anime

An anime adaptation was announced in December 2024.<ref> This project was confirmed to be a six-episode original net animation (ONA) developed by Enishiya, with TBS Television managing planning and production.<ref> The series is directed and scripted by Shinya Iino, featuring character designs and chief animation direction by Keita Nagahara, while Yoshiaki Fujisawa composed the soundtrack.<ref> The anime aired from June 28 through August 2, 2025, on various streaming services including Netflix, Amazon Prime Video, Abema, and U-Next.<ref> The opening track "Happy Lucky Chappy" is performed by Ano, and the ending theme "Glass no Sen" is sung by Tele.<ref> Outside Asia, Crunchyroll streamed the series,<ref> whereas Medialink secured licensing for the Asia-Pacific region via Ani-One Asia's YouTube channel.<ref>

Reception

Takopi's Original Sin received the Excellence Prize at the 51st Japan Cartoonists Association Awards in 2022. It attained third place in the male readers' category of Takarajimasha's Kono Manga ga Sugoi! 2023 rankings and was positioned ninth in Freestyle magazine’s "The Best Manga 2023 Kono Manga wo Yome!" list. The manga was also a nominee for the 16th Manga Taishō in 2023, ranking tenth among eleven contenders, and earned a nomination for the same year’s 27th Tezuka Osamu Cultural Prize. Furthermore, it was shortlisted for the Best Comic category at the 54th Seiun Award in 2023.

By February 2022, the series had exceeded two million daily views on the Shōnen Jump+ platform. The debut volume recorded first-week sales of 41,277 copies, while its follow-up volume sold 198,505 copies within its initial week. As of May 2022, total circulation—including digital editions—surpassed 1.2 million copies.

See also

• The Ichinose Family's Deadly Sins, another manga title authored by the same creator