There were a few novels with apocalyptic theme: "Living Again in the Apocalypse","Degeneration","I'm a Hunter of the Apocalypse","Cute Apocalypse","Apocalypse Killing Saint","Apocalypse Awakening","I Open a Hotel in the Apocalypse","Apocalypse Fake Hero","Apocalypse Light of Hope","Happy Apocalypse","Apocalypse Meltdown", and "Revival of Reiki in the Apocalypse". I hope you like my recommendation. Muah ~