Shirakawa Yu has been living with his grandparents for whatever reason, but after more than 10 years with her new spouse, his father-in-law, he is obliged to live with his mother. His sisters-in-law, Shirakaw Kyoko, Ryoko, and Anzu, who have matured into stunning women, await him there. The sisters greet him warmly and allow him to use the room of their father, who is frequently absent due to his archaeological research. He discovers a weird jar in the room. It’s a cursed jar that will inflict the worst of curses on him unless he gathers women’s love juices within a certain amount of time.