After recapping their previous encounters with the mysterious "Nectar of Inana" jar, the Shirakawa sisters are surprised when the artifact's curse strikes again. This time, Anzu is unexpectedly transformed with male anatomy, leading to a series of erotic discoveries. With Kyouko's eager assistance in relieving the tension, Anzu explores the sensations of her temporary change before the curse finally lifts.
While the other sisters are away, Yuu and Kuri attempt to break Kuri's curse through intimate acts. After a series of erotic encounters and a sudden transformation triggered by a mysterious medicine, Kuri and Ryouko team up to pleasure Yuu, eventually leading to Kuri returning to her original form.