Maika Asai, an ordinary housewife and mother of a college student, lived a quiet life with her husband and son. One day, she accidentally discovered a porn magazine in her son's room and became captivated by the lewd submitted photos inside. Stimulated by the images, she spontaneously began masturbating. From that day on, her daily life began to change drastically. She started visiting dating sites and seeking out new men. When her son found out about her actions, he began to question the image he'd always held of his mother. The relationship between mother and son faces a new and intense trial.