Vampire prince?!

Encre a painter had lived in a little village for a long time there is a war going on between monsters/humans and vampires after Encres brother get drafted for the war. After a while of serving the army he dies and now Encre has to take his place. When looking around in the village with Eterna they find a little bat Eterna wants to kill it but Encre refuses. Then runs away with it into the forest figuring out it was the prince of vampires?! What has Encre got himself into now...