Kono Sekai ga Izure Horobu Koto wo, Ore dake ga Shitte Iru ; Kono Sekai ga Izure Horobu Koto o, Ore dake ga Shitte Iru ; Kono Sekai ga Izure Horobu Koto o, Ore dake ga Shitte Iru - Monster ga Arawareta Sekai de, Shi ni Modori Level Up ; この世界がいずれ滅ぶことを、俺だけが知っている ; この世界がいずれ滅ぶことを、俺だけが知っている～モンスターが現れた世界で、死に戻りレベルアップ～
An ordinary office worker, Akira Ichijo, was attacked by a Minotaur on his way home from work. In the next moment, he woke up in his office desk, Akira was resurrected from death, inherited his level and status, and possessed a unique skill called "Return from the Underworld" that allowed him to restart his life at a certain time. Now Akira makes full use of his skill and everything he had to search and survive with his childhood friend Nao Nanase to face this cruel world!!