Yuya, a nephew, is staying at his aunt's house near the university he attends. He is content with living alone with his beloved aunt, although it is only for a limited time until his uncle returns from a business trip overseas. However, living together with his beloved aunt stirs up his lust day by day, and Yuya, unable to contain himself, secretly masturbates using his aunt's underwear as a stimulant. Today, he was once again immersed in a moment of bliss, smelling her panties, when his aunt showed up...