Ryoko has been living alone with her son for the past three years, as her husband is on a business trip overseas. One day, her son's friends Akira and Naoya come to visit. Naoya accidentally sees Ryoko masturbating, and becomes so excited he loses his mind and approaches her lewd body. Ryoko initially resists, but is awakened by sensations she has not felt in a long time, and although she is hesitant, she accepts. Later, when Naoya hears about what happened, he also...