A newly dating couple, Sumire and Kenji, share a pure and innocent relationship, holding hands for the first time after school. One day, Sumire visits Kenji's house to greet his father, Kengo. While teasing the couple's shy behavior, Kengo is gradually captivated by Sumire's politeness and charm. When Kenji asks Sumire to cook him a birthday meal, she decides to make curry. Eyeing the meal with lust, Kengo secretly slips sleeping pills into his son's portion and adds aphrodisiac drugs to Sumire's. Pretending to be concerned as her arousal grows, Kengo gropes her repeatedly. With Kenji unconscious beside them, Kengo gives in to his uncontrollable desire and takes her like a beast.