Monsters and Monsters

Finally, the world has received the supernatural, but only with monsters and monsters. Humans can extract almost nothing scientifically useful from it. They affect human beings and seriously affect the life safety of all mankind. It is almost impossible to counterattack, and Organization C formed by gathering all hope can only patch up the world. My story also begins and ends at that time. I'm not trying to be dumb, it's an obvious hint, an infinite loop.