Jinrou e no Tensei, Maou no Fukukan

Jinrou e no Tensei, Maou no Fukukan (人狼への転生、魔王の副官) is a light novel series by Hyougetsu with illustrations by Nishieda. A manga adaption with art by Isaza Terata is serialized in Comic Earth☆Star.

Plot
Protagonist Vaito, who was reincarnated as a werewolf magician, becomes the Vice Commander of the Third Division of the Demon Lord’s Army.

Having captured a frontier trade city, he is in charge of controlling and protecting it.

Formerly a human, now a monster, he understands the feelings of humans and the feelings of monsters as well. Thanks to that he is being considered as a great commander with both wisdom and courage by others, but in reality it is just one hardship after another:

Making the violence loving demons obey, doing something about the always complaining humans, today also he is working hard as the main leader of the demon army.