Natsume Kanade wakes up with a terrible headache from the day before unable to remember who he is. Being confronted by a strange man with dark-rimmed glasses who calls himself "God" and being told that he is a...

After shedding bitter tears to save a hopeless dark fantasy world, I destroyed everything, killed the Demon Lord, and then returned to the past. Now I'm trying to save the world with the system I received as a...