Mina is a lingerie designer and career woman. One day, her uncle calls her to look after his son, Shota, and she reluctantly accepts. However, Mina also has a business trip, so since she has accepted the request, she takes Shota with her and decides to share a hotel room with him. Even though he is a little boy, Shota is cheeky and perverted, and makes Mina angry by playing pranks on the underwear that Mina has brought to be displayed at an exhibition. Mina, who is angry, slaps Shota in the face. That night, Shota wants revenge on Mina, so he plays a prank on her as she sleeps.