Ars Goetia ～The Boy Who Was Called Incompetent Uses 72 Demons To Become Unstoppable summary:

“I have decided not to expect anything from you anymore.”One day, Norman is told this by his father and is kicked out of the house.There was no way around it. Because Norman could not use magic at all.However, Norman’s fate changes drastically when he encounters the Grimoire “Ars Goetia”.The Grimoire called “Ars Goetia” was used to summon 72 demons.The demons summoned by it, however, bring about a shocking revelation to Norman. Yes, there was a reason why Norman could not use magic.And so, Norman becomes the strongest sorcerer in the world by subduing numerous demons