Deep in the mountains in western Tokyo, there sits the hidden Gekka girls' high school. All the students attending are actually...ninjas! Kasane Hattori and Saika Kirigakure are two of the very ninja girls enrolled to Gekka. Kasane sees Saika as a rival to surpass, and is working every day to improve her ninja arts. But first, she'll have to finish her homework...in seduction?! It's school rules to train your seduction skills with the girl you're rooming with, but how is Kasane supposed to practice when her roommate is none-other than Saika Kirigakure?!