Gods, Demons, and Dragons

"Yuu, didn't you know a long time ago there's a sudden light and the world changed"

"You mean the roles?"

"Yes, there a sudden light 3000 years ago after that the humans started to evolve, others became Demons, Gods, and Dragons"

"So they are not totally Gods, they just powerful humans?"

"Yes, they just call themselves God or something"

While Yuu and Maine talking about the history of roles, Zoel continue to train to gain experience to magic.

If Zoel is done training what level can he become?