GanGam! (english version)

What if you discovered that you weren't fully human?
Marvens, an ordinary teenager, learns overnight that he is half Spirit. Intrigued by his origins and nascent powers, he joins an organization of exorcists where he befriends other fighters, including an old acquaintance who has become a Spirit. But their mission is far from mere training: a fearsome Spirit king, Glucux, threatens the balance of the world. Between spectacular battles and unexpected alliances, Marvens will have to push his limits to survive.