Pillar Destroyer Blade: God Eater

The end of the world is interpreted in this world. There are countless ruins and desolate gods everywhere. Human beings can only live in the "harbor" and look at the eternally red sky. But even in such a world, there are still people who hope for beauty. Aoba Sakura, the girl known as the "Ghost of Ereshmar", entered a strange place during a mission. The place was different from the dust of the doomsday and was full of green. When she turned around and looked behind her, the entrance had long since disappeared. (Full book Demon Slayer: Kimetsu no Yaiba)