Yuichi is staying with the Nakano couple until his uncle's long business trip is over. His uncle's business trip is about to end soon. He needs to find a new place to live, but he's excited to be living alone with his aunt Nanao, whom he secretly admires. His feelings for Nanao grow stronger each day, and even though he knows it's wrong, he uses Nanao's used underwear as a stimulant to comfort himself. One day, Nanao finds him masturbating as usual.