Surrounded by the silence of night, the pool becomes a sanctuary for Ai, a married female teacher and swimming club advisor who struggles to let go of her dignity. Yet instead of returning to an empty home where her husband is never present, she chooses to release her emotions in the locker room, indulging in masturbation once again. Unbeknownst to her, delinquent students witness her act, drawn to her voluptuous breasts barely concealed beneath her tight school swimsuit. In that instant, Ai has no idea she is about to be gang-raped. The series of events unfolding in the dark pool area gradually take control of her mind, leading her to awaken to new, unexpected pleasures.