Hyougetsu 
Der Werwolf: The Annals of Veight Volume 4 [EPUB ebook] 

With the eight southern cities joining forces with the demon army to create the new Meraldian Commonwealth, Veight’s dream of creating a nation where humans and demons can live in harmony is almost within his grasp. Upon discovering the sword recovered from the battle at Zaria is an heirloom belonging to the viceroy of Krauhen, Veight sets off to return it as both a gesture of goodwill, and as a way of putting Krauhen in his debt. On his arrival, he meets not only Krauhen’s viceroy, but also a dangerous foreigner, the imperial princess Eleora. This meeting sparks a chain of events that culminate into one epic battle between the north and south, deciding Meraldia’s fate once and for all!