Akane, the wife, has recently grown tired of her husband's selfish desire for sex whenever he has free time. Meanwhile, her daughter, Ayana, is happily married to her boyfriend, and even though Akane is there, they have sex in her room... When she is aroused by the sound of his voice and indulges in masturbation, she is seen by her daughter's boyfriend, Tomoma. Akane panics, but Tomoma's innocent reaction to his erection makes her suck his cock, and they end up having a physical relationship. Since then, they have been secretly seeking each other out of sight of others...