To prepare for university entrance exams, Satoshi lives with his aunt Chiaki and attends a cram school in Tokyo. One day, Satoshi notices something strange about Chiaki's behavior and, instead of going to cram school, hides in the closet to keep an eye on her. His aunt's secret... she was bringing men into the house for affairs while her husband was away on a business trip! Satoshi, having caught her weakness, says to Chiaki, "I'm telling Uncle!".
