Takumi lives next to Mizuki and Satsuki's house. They have been good friends since they were kids, going shopping and skiing together. One day, Kazuyoshi, Takumi's father, brings two girls, Saori and Yui, back to their house, and accepts them as new family members. At first, he is confused, but gradually becomes closer to them. Mizuki gets impatient, and begins to approach Takumi boldly. And Satsuki is in love with Takumi as well. The winter holiday starts.... The days full of sex with Takumi.... From "like" to "love".... A love story full of love and desire starts now...

For some reason, Shirakawa Yu has been living with his grandparents, but he is supposed to live with his mother after an interval of more than ten years with her new husband, that is, his father-in-law. There, his sisters-in-law, Shirakawa Kyoko, Ryoko and Anzu, who have grown to be very beautiful women, are waiting for him. The sisters welcome him, and let him use the room of their father who is always absent because of his archaeological studies. In the room, he finds a queer jar. It is a cursed jar that will cast upon him the worst of curses unless he collects women's love juices within a limited period of time.