Jun is visiting his relatives, who live with his aunt and uncle, during the long holiday. Jun has always had a crush on Misato, who is too young and seductive to be called his aunt, and whenever he has the chance, he comes to stay with her. But one night, he witnesses Misato, who is not satisfied with sex with her husband and is secretly masturbating... Unable to suppress the urge to do so, Jun approaches Misato, who is dozing off while his uncle is away, and his desire explodes.