He’s not a hero, he’s a demon king RAW novel

The Demon King Belzebut, who succeeded in ruling for the longest time in history and led the demon tribe to its heyday.
However, it was not a warrior who had gone through countless battlefields, but a magical girl who defeated him.

A demon king whose body and mind were torn apart by a magical girl.
However, it seems that his death will be the beginning of the end of the demons and the world.

In the end, the Demon King used the power of the goddess to revert to his previous life as a human and to the past seven years ago.

But why? His past keeps getting in his way.
And what else is that? Why are robots all of a sudden?