One day, an ordinary college student, Tsunoya, whose only problem is his virginity, scratches the car of Hideyuki Yoshino, a mysterious and powerful yakuza-like celeb, and is forced to take care of the Yoshino family's children instead of paying for repairs! He immediately moves into Hideyuki's mansion, but Haruto, a four-year-old boy, doesn't like him, and the domineering Hideyuki begins to play naughty and lewd tricks on him. He is not happy about it, but he starts to have dirty dreams at night...?