An autonomous city of Ainz that prospered with advanced sorcery and magic. The one who broke the peace was the beautiful, one-eyed, one-armed, one-legged young man ─ the legendary magician Ains Silvetas, who laid the foundation for everything 2000 years ago!Time passed while he was confined in a hut in the forest, and when he got stuck in his research and went outside, he found that the "memo" was a "Magic Book" that was considered the Bible, and he himself had become a revered existence as a "Majin". It was.The person himself, who does not realize this, follows his curiosity and embarks on a journey to explore magic.Touch the reason of the world and unconsciously destroy the equilibrium of the nations! A full-fledged fantasy of the carefree strongest demon!