Yu Shirakawa has been living with his grandparents, but now he is going to live with his mother after ten years of separation. Her new husband, his stepfather, has three very beautiful daughters who are now his stepsisters. These girls—Kyoko, Ryoko, and Anzu Shirakawa—are waiting for him, welcome him, and let him use the room their father uses for his archaeological finds. In the room, Yu finds a cursed jar which, unless he collects woman’s «love juice» within the period of time, will cast a terrible curse on him. 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, Shirakaw 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.