Legend of the Millennium Dragon
鬼神伝 (original)
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.
Starring Satomi Ishihara, Kentaro Ito, Yasuyuki Kase, Sôsuke Komori, Kensho Ono, Takashi Kondo, Masaaki Tsukada, Shunsuke Sakuya, Shidô Nakamura, Showtaro Morikubo
It's a animation and action & adventure movie, and has a rating of 5.6 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Indonesia.