My Best Friend is an Eldritch Horror

Good things come to those who wait. Damien Vale didn't, and now he's bound to an Eldritch creature from beyond the farthest reaches of the universe. It's unfathomable, utterly evil, and likes to be called Henry. To Damien, none of that mattered. He was going to learn magic, and he'd be damned if he let something as small as this set him back. (Source: Webtoon)