Just after her son, Kenji, transferred schools, he brought a friend home. His mother, Miki, welcomed them with a smile, but that night, her bra, which had been left out to dry, was missing. The suspicion immediately fell on Kenji's friend, Satoru. When Gaku, the class leader who knew Satoru was accused, learned of the incident, he decided to take revenge on the Matsuzaka family. Gaku seized the chance to stay overnight at Kenji's house and, in the middle of the night, assaulted Miki, secretly photographing her lewd breasts. Using those photos, Gaku and Satoru forced Miki to go braless and, together with their friends, tormented her with their youthful, lustful desires.