Yoshito harbors intense feelings for Ayumi, his friend Takeshi's mother, becoming aroused and flustered by her every move. One day, while visiting Takeshi's house, Yoshito accidentally discovers Ayumi secretly meeting with his other friend, Naoto. To his shock, he realizes they are fully aware of his presence and are actually aroused by the thrill of being watched. Overcome with jealousy and rage, Yoshito uses Naoto's affair as leverage and forcefully confronts Ayumi.