I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too, Vol. 7 (light novel) — Miku

Demonic forces began their attack on humanity by invading the kingdom...but Yuuya exterminated them before they could really get started! His control over demonic and holy powers elevates him to a whole other level. He is preparing to evolve into his final form when he's attacked by a god who is intent on preventing that evolution! The battle begins between those who seek to decide the fate of humanity.