Hyougetsu 
Der Werwolf: The Annals of Veight -Origins- Volume 2 [EPUB ebook] 

Representing the Demon Lord’s Third Regiment, the werewolf mage Veight has successfully formed an alliance with the trading city of Ryunheit. He slowly but surely progresses toward his goal of coexistence between humans and demons—but suddenly, an unexpected visit from his master, Gomoviroa, whisks him away to the Demon Lord’s castle. Slated to appear before none other than the Demon Lord himself, how will Veight explain his actions to the king?!