Miho Toono, caught in abnormal acts with her lover by her virgin son, finds his eyes locked onto the scene he's witnessing for the first time. Misinterpreting what he saw as normal sex, the boy forms a distorted understanding of intimacy. Tormented by the fear of her affair being exposed and the guilt of instilling incorrect sexual knowledge, Miho resolves to personally correct her son's misconceptions—using her own body to provide him with proper sex education.