Moribito: Guardian of the Spirit

When the crown prince, Chagum, is born with an ancient water spirit inside him, the emperor sends assassins to dispatch the child - but Balsa, a warrior hired by the empress to protect her son, won't let them murder Chagum without a fight.

Moribito: Guardian of the Spirit is a 2007 adventure fantasy movie, starring Kôji Tsujitani, Naoto Adachi, Hirofumi Nojima. It holds an IMDb rating of 8.2/10 from 3,241 votes and runs 25m.