Kunoichi Gakuen Ninpouchou

Nightfall brings the shadows of Koga to Iga, presenting a new danger for the school's students. Following an intense sexual encounter, Mashiba Aya, best friend of Yatsurugi Shinobu, becomes infected with a parasitic insect and falls under its control. Kage Lena now faces the same fate, developing identical uncontrollable urges. The sole known cure is secured in the laboratories of the Koga Institute, and retrieving it is the only hope for saving Kage Lena.