Akira's life changes drastically when his father marries Yukie, bringing three new stepsisters into his home. With his father absent due to archaeological research, Akira soon finds himself entangled in forbidden sexual encounters with both his stepmother and his stepsister, Nana. Driven by a mysterious sweet scent and the influence of a "bottle of pleasure," Akira begins a secret and taboo relationship with the women of his new household.
Akira continues his quest to collect "love juices" from his step-sisters to fulfill a contract with the goddess Inana. After a vivid dream involving his stepmother and sister, he focuses his efforts on Miu. Through a series of seductive encounters, Akira manages to secure the second bottle of juice, though the risk of discovery looms as he pushes the boundaries of his relationship with his step-family.