Five years ago, Tsubomi and Rei Kuruki's mother remarried to a wealthy man who was the president of a large company, so his life was more prosperous. However, because of the hard work of raising 2 sisters for a long time, her body has weakened, many times she has to be hospitalized and discharged. The stepfather of both of them, because he is in a state of sexual deprivation, always feels frustrated and uncomfortable. In addition, his wife's 2 stepchildren were chaotic, his father was cheating, so he exploded the pent-ups for a long time and crushed her to fuck, both punishing and satisfying.