Koko-chan is a 20-year-old vocational student, a pure girl with virtually no prior experience with men. Suddenly, a dominant M personality awakens within her, drastically altering her behavior. Though her reactions might seem unsettling at first, in response, a hidden aggressive, seductive side emerges from within. The result? An unstoppable erotic aura and mischievous, teasing sadistic play that won't stop until she's drained every last drop.