Yumi was spending every day masturbating. Yumi, who had an extraordinary sexual desire, could not be satisfied with the couple's life alone, could not take the risk of running affair, and had no choice but to indulge in masturbation day after day. And one day when frustration has reached its limit, Yumi finds out that her son is a virgin, and goes beyond the forbidden line to help her child graduate from virginity. However, Ami's blood-bearing son also had an extraordinary sexual desire. That desire causes a runaway targeting Ami in the wake of her first experience ...
