A sudden bolt of lightning hits an old man...but! The lightning bolt rejuvenated him to the good-looking guy he was in his prime! His name is Gigi Allegarcia. He was called "the strongest who surpassed the strongest" and "a man who was loved by everything but magic"...he was the demon king of the previous generation.
Goinkyo Maou-sama No Kaerizaki - Raw Chapter 6
Goinkyo Maou-sama No Kaerizaki - Raw Chapter 7