Satoshi, a nephew who lives in his aunt Chiaki's house and attends a cram school in Tokyo for college entrance exams. One day, Satoshi noticed that Chiaki was acting strangely, so he didn't go to cram school and hid in the closet to keep an eye on Chiaki. Her aunt's secret... it's that she took a man home and had an affair while her husband was away! Satoshi takes advantage of his weakness and says to Chiaki, "I'll tell my uncle!"
