Takumi still goes to university and he is surrounded by pretty women who take care of his household and are friends for long time. As it is a long time friendship Takumi sees the pretty women as his own step sisters. But one day he gets two beautiful adoptive step sisters, who are of unexplained reasons included from Takumis step father. In the beginning is the older one, Saori very cold to Takumi but Takumi is trying befriend her. Of course it makes the other girlfriends jealous. Takumi is being mugged and made to have sex.