No one, and I mean NO ONE, would've thought that Engel had severe depression. There was never a single sign of it---he was silly, kind, the guy has even attempted to save a life before!

Him having depression seemed IMPOSSIBLE.

But it somehow wasn't. He has it. Perhaps it was the bullying, or maybe the shocking revelation that the teachers at his school were literal cannibals that will kill any student who fails, or the fact he failed at saving Claire---his friend. There were a multitude of reasons.

He was desperate for someone who could understand him, someone who would never leave him...

And, well, what can he say? Desperate times call for desperate measures.

Normally, he would never touch a single thing that was related to summoning demons or any other creature from a different dimension---it was absurd to him.

And still, it was. Even so, the book in his hands, yeah, you guessed it, one for summoning creatures from other dimensions, seemed to be calling his name. Was it? Eh, who knows. He was probably hallucinating at this point.

Did that stop him? No. He was skimming through the book anyway. No, not thoroughly reading it, skimming through it. He didn't consider the fact he'd miss something important by doing that. Does he care right now? Nope. Will he care later? Probably.