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. However she has been sexually frustrated for a long time! Her frustration continues until one day, she receives a phone call from a mysterious man promising her satisfaction...

As she reaches climax, her son Kazuhiko opens her door and finds her with toys occupying each of her holes. Misako tries everything to cover it up, but her son refuses and instead gives her a deal that she cannot refuse: "if you do as I say, I will not tell dad." Having no other way out of the situation, she agrees with her son's request. Although she refuses the lustful temptations, little by little her body craves for more!

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 for her. She can no longer go back to an ordinary life. Misako is now Kazuhiko's slave for her lust and passion. The wall of sanity is now torn down, but things are just getting heated up for the next level! There is no stopping now.

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. She though her secret love affair with her son would be kept under the dark, but things take a big turn. What surprising actions will Kazuhiko take to fulfill his lust? How will Misako deal with it?

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. Instead, the one she truly desires both mentally and physically is Kazuhiko, however she only has a few days to make a decision whether to be his lover or go back to being a normal family.