Unrivaled Chaos Emperor (Tales Of Ragnarok)

Kai runs away from his Yakuza family after being driven by a monster within to assault his classmates. He gets mixed up with the devils of magical world meeting Kono of the Asmodeus Clan aka the Viol Dragon Emperor of Supremacy, the one destined to stand at the pinnacle of all races. Kai sells his soul to rescue Yuri...