Newlywed Koichi, accompanied by his wife, returned to his parents' house where his mother and brother-in-law live for the first time in a long time. However, by chance, his brother and his wife have a physical relationship. Furious that her wife was cuckolded, Koichi surrenders himself to revenge and insults his sister-in-law, Hisaki. The happy family has collapsed, and the family home has turned into a lust hell, and the days of rape against Nisaki continue.
