Keiko is a first-year female college student who frequents the establishment Maurice. There, she befriends Catherine, unaware that Catherine is the drag persona of Shinya, a male college student employed at the venue. Keiko bears a striking physical resemblance to Catherine, a central element shaping the narrative's dynamics.

Her friendship with Catherine deepens through their interactions at Maurice. Concurrently, Keiko navigates a romantic relationship with another male student, preparing for their first physical intimacy. This relationship becomes a focal point of conflict for Shinya, who harbors romantic feelings for Keiko in his male identity. Shinya attempts to sabotage Keiko's relationship while sustaining his Catherine persona, resulting in complex interactions where he engages with her through dual identities.

Keiko's role centers on her resemblance to Catherine and her entanglement in Shinya's struggle to reconcile his conflicting identities and romantic pursuit of her.