I love my father-in-law more than my husband...

Nanami returns to her husband's parents' house during the Obon holiday. Toru, who was a childhood friend of her husband Takaya since her student days and now her stepfather, was also a close figure for a long time. Toru was kind, reliable and admiring to Nanami. As he grew older, this changed into a kindness of the opposite sex. Then, when Takaya is late for work and ends up spending time alone with Toru, Nanami can no longer contain her feelings, and she seduces Toru, who is supposed to be her stepfather, with her obscene breasts...