Immediately after the bell signaling the end of class rang, the seemingly normal classroom that was filled with students erupted into blinding white light. After that, as if there had never been any life in the class in the first place, everyone that was present in the class disappeared. But by some weird twist of fate, those people that had supposedly disappeared were reborn again in a fantasy world filled with magic and monsters. Starting over from the very beginning, will they be able to survive whatever this new world has in store for them?