I am the Devil's Incarnation

One day, Haru accidentally summoned a devil through a paper that looked like a fake pamphlet, no matter how Haru saw it. Although everything is done, he had summoned a devil. But the problem was that the devil was not some scary old dude or a nose-bleed type handsome chad but an UwU type baby. What's gonna happen now with their life? Start reading the novel to understand the title of the story. Also, ... ... ... Nothing. Have a nice day!!