The son-in-law, who will live with his wife's parents, is immediately attracted to the big tits of his mother-in-law, Aoi. Aoi was kind to her son-in-law without knowing it, but one day she was sought after by her son-in-law who couldn't stand the obscene big tits, and eventually developed into sex. Aoi, who should have refused, is lustful, and while her husband is mud, she wears erotic underwear and seduces her son-in-law.
