Zilbagias the Demon Prince: How the Seventh Prince Brought Down the Kingdom Volume 5

Zilbagias has arrived at the front lines of the war against the Panhuman Alliance. The attack on Evaloti, the capital city of Deftelos and a crucial stronghold for the Alliance, begins in earnest. And though seemingly every possible advantage favors the denizens of the dark, humanity will not go down without a fight. Heroes, Swordmasters, and elite forest elf mages from across the Alliance have banded together to man the lines—ensuring that every inch the demons take is paid for in blood. This of course puts Zilbagias in a convenient position as each demon slain makes his job easier, and each human he kills bolsters his own power further...even if it comes at the cost of both his heart and mind.

[From J-Novel Club]