Miho and her husband decide to look after her brother's child for a few days. Yui is Yui by her nephew, who is obsessed with games and anime despite being a grown man, but as he begins to show the caring side she had as a teacher, she begins to actively engage with him. Because her sex life with her husband is unsatisfying, Yui finds herself using her nephew's dick to release her sexual desires. Her nephew then becomes sexually awakened and begins to thrust his dick into Yui at every opportunity, releasing his desires.