Kagefusa Manyuu

Driven by a deep-seated resentment, Chifusa's sadistic older sister initially seeks vengeance after her sibling accidentally steals her breasts using the Breast Flow technique. As a fierce protector of the Manyū family's traditional rule, she originally despised Chifusa for being chosen as the successor. However, after Chifusa promises to restore her after mastering her powers, Kagefusa abandons her grudge, transforming into a much more relaxed and easygoing person while retaining her signature sadistic streak.