How Not To Summon Demon Lord Light Novel Softcover Volume 12

"Acting out the part of a Demon Lord, Diablo accepted a quest from the King of Lyferia. However, after befriending the kobolds he was meant to dispatch, he faces off against the Kingdom of Lyferia. But that situation is changed in the space of one night, because of a shocking declaration of war from the Empire of Gelmed! The enemy lays waste to a citadel city with overwhelmingly powerful Magimatic Sols, conquering it. Diablo, on the other hand, runs into an entirely different kind of crisis!"