Sanada Beni is 13 years old now and she is part of a ninja family. She is finally a Red ninja after 13 years of age. She takes an oath of loyalty to fulfill all her missions as family's "red ninja" descendant. But the problem is she is still a ninja in training. Four years ago she accidentally met a boy named Kiyoshi Makoto. Now she is set off to his school to protect him. Now what will would happen as Makoto continues to protect the entrance ceremony and Beni protects him?

(Source: MU)