Sumire, a college senior who is currently living with her boyfriend, twists her ankle while playing tennis. At her boyfriend's suggestion, she calls a massage therapist. After being caressed in sensitive areas, Sumire feels pleasure and anticipation for the next session despite feeling guilty. When the therapist comes to her house again, she can no longer hold back and nods in response to the question, "Shall I extend the session?", engaging in a sensual affair...