This is the only time when Ai, who works as a female teacher and advisor for the swimming club, can free her mind. It was the pool at night after club activities were over. Wrapped in the silence of the night and wrapped in a wet competitive swimsuit, Ai feels pleasantly tired and, not wanting to go home without her husband, ends up masturbating in the changing room. However, a delinquent student sees her doing so… A student’s reckless behavior cannot be stopped by the sight of her voluptuous breasts spilling out of her competitive swimsuit. What Ai didn’t know at that time was that the pleasure of being raped would dominate Ai that night…