Shizuka Kominami is a shy, introverted female college student who finds adjusting to city life difficult. She struggles with social situations, particularly forming connections with men, and feels uncomfortable at a college mixer she attends.

At this event, she meets Ryou Kirishima, who initially appears as a beautiful, confident older woman. Shizuka forms a quick connection with Ryou, leading them to leave together. After drinking and talking, an intoxicated Shizuka goes to Ryou's apartment. There, Ryou unexpectedly kisses and seduces her. Shizuka initially interprets this as a lesbian advance but soon discovers Ryou is biologically male and a crossdresser.

Despite her typical aversion to men, Shizuka does not entirely reject Ryou's physical advances during their encounter. She awakens the next morning to find a note from Ryou promising further erotic interactions. Their developing relationship forms the narrative core.

Physically, Shizuka possesses black hair, green eyes, and a small stature.