This is where we belong in the huge academy city "Kivotos" formed by thousands of schools.　　Here, the arguments of students with guns in their hands become everyday scenes.　　In the midst of this, "Abydos High School", which was wrapped in sand, was on the verge of closing.　　Five students of the "Countermeasures Committee" who are struggling to get out of the situation meet an "adult" called "teacher", and the story begins to move.