Hero and Kashiwagi Minato had been unfairly bullied in class, crap every day Was overkill.

One day, the high school he attends is summoned to a different world. The monsters attacking the school building, the three months in the sky, and the mysterious emblem that emerged in the hands of 1,500 students across the school-they were exactly the same settings as the fantasy novel written by Minato's deceased grandfather.

The knowledge of the world that extends to the "back setting" and the benefits of special talents from the coat of arms-Minato, who has these, formed a party with Shiori Saito, who is called the "Saint of the Library", and unique girls.

Adventure in this world while living together in the school building. Life reversal story by summoning.