The story starts off with Yusuke's mother slowly stripping off her clothes in front of a middle aged gentleman who quietly observed, showing her naked body to the latter who remained stoic and silent.
As she started to feel anxious, the man reminded her she is no longer a virgin, and told her to relax a little more and enjoyed the foreplay which she complied.
After some time, where Yusuke's mother is finally aroused, she gave the mysterious man a blowjob, and he says that she must improve her sucking technique to prevent her husband from cheating on her.
Before he left, he married a new wife on paper but not in ceremony; Yusuke now lives only with his stepmother Misako and her daughter Shiina from a previous marriage.
After a brief tryst with his cousin Mio, he contemplates his feelings for his new stepmother and women in general, while remembering the time when he first witnessed his mother's adultery.
Yusuke begins to show his cruelty in their sex, and comes up with more ways to humiliate his stepmother while gratifying his sexual urges.
Shiina leaves for her grandfather’s place but ends up going willingly with three street punks; she lies back as they decide who gets her first thinking only of her mother’s actions.
When the police bring him home, they find Misako engaged in an orgy; she sees Yusuke and begs him to come satisfy her needs.
The main protagonist, Yusuke, is a high student who is traumatized forever after witnessing his mother's adultery during his childhood.
Unlike Yuusuke, Mio is sympathetic towards her aunt whose neglection by her husband in her marriage lead her to find solace in adultery.
However, as time pass, Yusuke's mother came to enjoyed the tremendous sexual pleasure of their lovemaking becoming a nymphomaniac, eventually she became lovers with her sex teacher.
In the OVA, he is shown to be a bespectacled middle aged gentleman with a vigorous and powerful libido who is extremely skilled and experienced in coitus and giving women sexual pleasure.