How Not to Summon a Demon Lord (Manga) Vol. 15

"Diablo's been working hard to root out the corrupt leaders of the church, but when Horn suffers a grievous injury, he has a sudden realization. All a demon lord has to do to solve problems...is act like a demon lord! The time has come for the roleplaying performance of his career, terrorizing the faithful as an incarnation of doom sent to annihilate the human race. There's just one problem. Lumachina really does believe Diablo is a god, and she's maybe taking him a little bit too seriously..." --