Anejiru: Shirakawa Sanshimai ni Omakase

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 curse...