Akira's father, an archaeologist, has remarried, giving him a new stepmother and three stepsisters: Yuki, Nana, and Miu. While on his honeymoon, Akira's father makes an archaeological find and decides to stay on site to supervise, leaving Akira at home alone with his new family members. After being discovered in bed with Yukie, his stepmother, Akira finds a box containing a scroll and three bottles. Using the knowledge his father taught him, he reads the Sumerian language on the scroll and finds himself in a contract with the goddess Inana, who tells him to collect the love juices of his sisters in the bottles before the next full moon, or else a terrible horror will befall him.