Masahiro, a father-in-law, has decided to live with his son and his wife. Masahiro is attracted to his pretty and gentle daughter-in-law Ayumi, and he can't help but rape Ayumi!!! Ayumi can't resist her father-in-law's obsessive advances, and is forced to do all sorts of obscene acts even when her husband is nearby. Before she knows it, Ayumi becomes addicted to her father-in-law's insatiable sexual desires...