The shadows of Koga creeping over Iga Yatsurugi shinobu's best friend, Mashiba Aya becomes a prey of the parasite bug, which took her life the same tragedy was about to happen to Kage Lena. The antidote stored in the Koga Institute is the only remedy that will help Lena. However, Shinobu gets caught by the traps in the Koga Institute. Will the girls from Iga handle this situation?