Over the course of history, there had been many prophets who predicted that the end of the world was near, but they were all just imposters. However, it really came true and people were at their wit’s end. Just like no one believed that the end of the world is near, the God that not many people believed in saved the world. It is in Saint Solyluna Academy that μ (Mu) is chosen – the only one that sits in the empty seat next to God and asks for salvation for mankind.