Miku has always lived as a boy, but her life takes a drastic turn when her childhood friend Rika, who knows she is actually a girl, transfers to her school. Determined to make Miku embrace her true female identity, Rika begins devising various schemes. Though Miku resists, her body instinctively responds in ways she can't control. Once her true gender is exposed, her male friends forcefully insert themselves into her life, engaging in intense and intimate relationships with her. Through these experiences, Miku's hidden emotions and inner conflicts gradually come to the surface.