“I want to go home!”
Cage, the hero, summoned to the other world, succeeds in overcoming adversity and hardship, and defeats the demon king.
I was happy that I could finally go back home, but when I came to my senses, everything reverted to the way it was at the beginning. Now I’ve repeated it countless times and reached a point where I can catch the world’s strongest demon king with my bare hands. To summarize, I am an overpowered protagonist rotting in this world.
“If I can’t do it, let’s make someone else finish the Demon King!”
To go back home the rotten hero starts raising newbie Heroes!