Onmyou Taisenki(2004)

Riku Tachibana is an average 1st year junior high school student who was supposed to be living a peaceful, ordinary life, but just after entering junior high he ends up fighting a duel against a mysterious man calling himself “a Warrior of Earth,” and Riku’s life is changed forever! Riku discovers that he is a survivor of the believed extinct “Warriors of Heaven,” Using a device called “DRIVE” and summoning a Shikigami, or “Divine Beast,” called Kogenta to his side, Riku devotes his life to the battle against the Warriors of Earth!

(Source: Sunrise)