His mother, Rin, has a strong libido. But his father is indifferent. That's why his mother is always sexually frustrated. Yosuke senses his mother's suffering, but pretends not to see that there is nothing he can do as her son. However, when he sees the lonely look on Rin's face while she masturbates, he makes up Kokoro. "I'll comfort my mother..." It was Yosuke's way of showing kindness. Rin also accepts her child, if only once. But Yosuke, who inherited the blood of the sexually prodigious Rin, has an insatiable sexual appetite that drives Rin crazy...