A young man whose motto is "Never commit suicide" happens to meet a boy with a cut mark on his wrist and follows him out of curiosity. However, the boy's path leads him to a world of "death" that he has never...

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...