Takopi's Original Sin (Japanese: タコピーの原罪, Hepburn: Takopī no Genzai) 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. An original net animation (ONA) adaptation produced by Enishiya and TBS Television was released from June to August 2025.