One day, a middle-aged man who was divorced and living a miserable life is suddenly visited by his niece Mahiro, who ran away from home after fighting with her parents. She then enters the house without permission and they begin living together. Mahiro, who has always been attached to her uncle, tries to rape him on the second night. Although she is confused, she cannot stop her desire... and so begins their lovey-dovey cohabitation sex life!!