Meet Chisato Mashiro, a seemingly typical young girl who thinks only of boys and meets her senpai. One day, She catches her uncle rummaging in her underwear drawer, and being furious about it, she lets out a stream of verbal insults and threats realizing that her uncle has crossed all the boundaries of what is allowed. He grope her breast and start to take some advances until Chisato gives in after getting wet and he took her virginity. She becomes her uncle's sex slave day by day and he wants her to get pregnant.