A disaster named Doom roams among various worlds, eroding and devouring the origin of the world. The world closest to the real world, after the war with Doom, saw gods fall and legends end. The surviving ones accidentally established a connection with the real world, reaching cooperation with Bureau 749 to assist the real world in preventing the invasion of Doom. However, after a long time, cracks appeared in the world barrier between the Doom world and the real world, and Doom found a new world once again.