Onigamiden - Legend of the Millennium Dragon

Onigamiden is a movie starring Kenshô Ono, Satomi Ishihara, and Takashi Kondô. A 15-year-old boy goes 1200 years back in time to find his unlikely destiny as the savior to end the war between humans and demons.
A spectacular journey of an unwilling young hero thrust into a mysterious past full of monsters, dragons, and strange hidden powers. Through a series of out of this world battles and adventures, Jun, a shy middle school boy, is transformed into a hero destined to battle evil and ensure harmony and tranquility in the world.