Iyo Shinohara, who made a brilliant debut as Madonna's super-sized rookie, finally makes her first appearance in Mature Comi!! Hayato is a college student who is close with the family of his next-door neighbor, Rika (Shinohara), a busty wife. One day, while visiting her house, he happens to find a vibrator... Just imagining the always kind and pure Rika indulging in masturbation with such a thing night after night makes Hayato's arousal uncontrollable. Meanwhile, Rika accidentally discovers him masturbating. Though bewildered by the fact that she's been caught, the two of them, both exposed, decide to relieve their long-pent-up sexual desires with each other's bodies...!!
