The school where the stand is ordinary at a glance. However, there was "Shinobu class" where activity was permitted in the school by night. Protagonist Kyoichi born in the family of the ninja was one of the students of "Shinobu class". Kyoichi liked ones lineage called "Shinobu" least and sent insincere student life...

A case to shake such a life greatly once happened. It is that danger approaches the body of girl, Mayuko whom Kyoichi stared at with admiration than before. The ringleader was the president of this school. "Womans body recurrence"

Now, it has become an illusion, Ninjutsu not thought to be real existence any longer. "With the memory before the life left, It is born in this world and goes out again" The secret art in the secret art, It died and the president on the verge seems to have had them execute. "Fetus with the memory"... Having been chosen as "Mothers body" to give birth, It was Mayuko.

Kyoichi for Mayuko, It was determined to work as despised "Shinobu". Kyoichi really, Can Mayuko be defended completely? Or... It attacks and violent ninja arts battle with the coming assassins starts.