Ochinos Kuta is translated into the Academy, which manages his grandfather. He knows little about it, except for the fact that students are mostly women, so he imagines that his life will soon turn into a charming haremist. When he is lost on the way to an isolated school, he discovers that there are many things that his grandfather did not tell him. School is actually a school for girls for the ninja! First, girls think that he is an attacker, and he barely runs alive! Fortunately, the misunderstanding is clarified, and it is under the protection of the beautiful and deadly chairman of the Student Council of Fusion Rindou. But even now his life will not be completely calm, because it is in full swing of the ongoing conflict between the Student Council of Fuuunagi and another group of students.