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It's about a boy who uses magic. He's a noble but a weak one, and he desires power. One day, he finds a grimoire in his library and summons demons. First, he summons an old guy, then a masochistic guy. Next, he summons a handsome guy with a cat's in his right hand and a left hand is a dog or something i forgot . Finally, he summons a fallen angel, a girl angel. It sounds like