Saizou performs male roles due to Japanese theater traditions forbidding female performers. This cross-dressing arises from professional necessity, not personal gender identity. Her father, a homosexual kabuki actor, deliberately raised her with masculine traits. At thirteen, her accidental discovery of her father's intimacy with another man triggered deep shame. The subsequent theater fire killed her father. She connects her name's linguistic link to "sin" with inherent corruption, internalizing enduring guilt over these events. She wields a specialized paper fan that unfolds into elongated binding ropes to temporarily immobilize Yōi entities. She also performs a ritual dance, rigorously trained since childhood by her father, that attracts supernatural threats. This dance mirrors mythological rituals summoning Amaterasu from seclusion. Joining the Ayashi team provides structured purpose combating paranormal dangers. Her operational role utilizes both martial skills and ritual capabilities, though profound psychological burdens related to perceived sinfulness persist as recurring challenges. Dialogue explicitly confirms her age as fourteen during primary events, referencing an absence fifteen years prior and the theater fire occurring when she was thirteen.