Synopsis
When night falls, the shadows of Koga descend upon Iga, bringing a new menace to the lusty vixens. After a torrid sexual encounter, Yatsurugi Shinobu's best friend Mashiba Aya becomes infected with a parasitic insect and succumbs to its control. Sharing those same insatiable urges, Kage Lena is about to face the same tragedy. The only known antidote is kept deep within the labs of the Koga Institute, and it is the sole thing that can save Kage Lena.