Synopsis

The protagonist is confused and alone after discovering that time has stopped and that everyone else has disappeared. He encounters an angel who reveals that all of humanity has been sent to another world to train with mana in anticipation of a great cataclysm, a period when monsters will emerge on Earth. The protagonist, left behind due to an apparent error, learns that this transformation of Earth will bring the ability to use mana, but he will have to train his body in preparation.