Rave Master Vol 2

Rave Master Vol 2 by Hiro Mashima. An Action manga rated Teen, published in English by Kodansha in 2004.

Haru Glory is chosen to wield the legendary Rave Stones, the only power that can stand against the dark Shadow Stones of the evil organization Demon Card. With his sword, his strange dog-like companion Plue and a growing group of friends, he sets out to save the world.