Yuichi decided to stay at Mr. and Mrs. Nakano's house until his uncle's long business trip ended. His uncle's business trip was almost over. He had to find a shabby house, but Yuichi flew away to live alone with his aunt Nanao, who had a secret crush on him. Her desire for Nanao grew stronger every day, and even though she realized she shouldn't do it, she comforted herself with used panties. One day, Nanao found him masturbating as usual.