This time, I won't be the devil.

During his brief career as a demon king after the time travel, Frey understood one thing - the demon king's ability has its limits.
Even if you plan carefully and make all the calculations, you cannot defeat the brave man with the aura of the protagonist.
He hid his strength, blocked the door to the Novice Village, set hellish traps, and finished off the enemy after the battle without any nonsense. He had clearly avoided all the mistakes a villain could make.
But in the final battle, the hero still shouted about friendship and bond, and cheated again, knocking Frey to the ground.
"Integrity, courage, and sacrifice. A filthy undead like you cannot understand human virtues."
The brave man looked down at Frey and began to preach from a high position.
"As long as I can destroy the Demon King, I'm willing to do anything."
"Willing to do anything? You said so yourself."
After receiving the hero's promise, Frey smiled with a plan in mind and launched the final magic.
This time, I won't be a demon king.
(This is a story about a time traveler who, after giving up his identity as a demon king, ventures back into another world.)
[Daily Love (?) + Abstract Warning]