It's been a year since Misako has been married to Yosuke Amamiya. Misako loves her husband more than anything in the world and takes good care of the household.
As she reaches climax, her son Kazuhiko opens the door and finds her with toys in each of her holes. Misako tries everything to cover it up, he refuses and instead gives her a deal that she can refuse: "if you do as I say, I will not tell"
Misako finds out her stepson, Kazuhiko, caused all of the pranks. She does her best to fight off Kazuhiko, but it's already too late. She can no longer go back to an ordinary life. Misako is now Kazuhiko's slave for her lust and passion.
As each day passes, Misako loses her sanity, no longer feeling guilty about betraying her other half. What once was a sin is now a pleasure she cannot live without. What surprising actions will Kazuhiko take to fulfill his lust?
Misako was in shock when she saw her stepson Kazuhiko engaging in a sexual act with her sister Emiko. Having been surprised by this incident, Misako found herself feeling jealous and begins to devise a plan to win Kazuhiko back.
Kazuhiko continues the sexual rendezvous with his step-mother's Sis, his aunt, Emiko. Now his step-mother Misako's jealousy grows by the second. She soon realizes that she no longer needs her husband Yosuke.