Five years ago Tsubomi and Rei's mother remarried. Both of them have a more prosperous life than before. But before she had to work hard to raise two children, her body collapsed and had to be constantly hospitalized. Only the stepfather has to take care of his two daughters. But it seems that the two do not care about this father at all. Not listening, not greeting, not paying attention to him at all. Because she hasn't had sex for a long time and is too angry with Tsubomi's chaotic attitude. The stepfather decided to punish and force his two daughters to repay their long-standing support by... Become his sex slave!