The Otomi couple moved in next door to Daisuke, a part-time worker with no interest in women. Daisuke was troubled by his neighbor's wife, Rina, who moans loudly at night. A married woman with a big, plump butt. Daisuke peeks into her room on a whim and finds her masturbating while moaning like a wild animal... The shocking sight leaves him unable to move, and Rina, who notices something is wrong, finds out he is peeping... The condition Daisuke is given is to help Rina release her sexual desire...