Monster Tribe, Vol. 1 (Manga)

Ten is a high school boy who wants nothing more than an average, peaceful life...which is tough for a half-human from a family full of monsters. After a portal is torn open between the monster world and their own, Ten and his brothers are pressed to hunt down the invaders threatening humanity--with the promise that success means getting a wish granted. But can they safely see their mission through? And will Ten ever achieve the normal days he dreams of?