With the marriage of her daughter Maki, mother Ai has finished raising her children. Just when she was about to enjoy her own life, she was asked to mediate between her husband and wife. Even though she listens to Maki's story, she doesn't get her point, and her son-in-law, Shinichi, also listens to her story... It was said that Shinichi was in love with her, who was her stepmother. Shinichi can't hold back her overflowing feelings and pushes her down, but Ai holds him back. However, she felt a tingling sensation in the skin of the man she had touched for the first time in a long time, and her love hand unconsciously moved to her crotch...