Gyakuten Shoukan: Urasettei made Shiritsukushita Isekai ni Gakkou Goto Shoukan Sarete

Hero and Kashiwagi Minato were regularly subjected to harsh bullying at school. One day, the entire high school was transported to another world. The school faced monster attacks, spent three months in the sky, and 1,500 students discovered a mysterious emblem on their hands—settings identical to a fantasy novel written by Minato's late grandfather. With knowledge of the world and special abilities from the coat of arms, Minato formed a group with Shiori Saito, known as the "Saint of the Library," and other unique girls. They continued their lives within the school while embarking on adventures in this new world.