Jun went to his friend Shohta's house with other friends. There, he accidentally witnessed Shohta's mother, Ria, masturbating while talking on the phone with her lover. Jun, who had been interested in Ria, was shocked but couldn't control his youthful sexual urges. He decided to expose her affair and start blackmailing her. To keep it from her son, Ria agreed to a deal with Jun, but she underestimated the magnitude of his desires. Ria's endless days of madness begin...
