Kochou is a female ninja apprentice serving the antagonist Muhousai in the OAV series *Samurai XXX* (*Youkou no Ken*). Her name, meaning butterfly, reflects butterfly-themed attributes consistent with the animal theme naming of Muhousai's disciples. Kochou possesses the unique ability to transform into a butterfly, setting her apart from other ninja characters who typically rely on brightly colored outfits and overt techniques. While she utilizes standard ninja weaponry in combat, she is noted as the only one among her group to actively employ such tools.

Her role involves guarding portions of a treasure map tattooed on the bodies of female ninja, which become visible only during orgasm. Kochou demonstrates unwavering loyalty to Muhousai despite his dismissive attitude towards his subordinates, persisting even when her life is endangered during confrontations with the protagonist Matagoro Yoshimura. She meets her demise opposing Yoshimura's mission to retrieve the map segments. Muhousai displays no emotional reaction to her death, merely acknowledging Yoshimura as a potential threat, underscoring the one-sided nature of her loyalty and expendable status within his group.