Watch The Great Yokai War for Free: How to Stream the Movie Online at 123Movies. . A young boy with a troubled home life becomes "chosen," and he stumbles into the middle of a great war of yōkai (a class of mythological creatures), where he meets a group of friendly yōkai who become his companions through his journey. Now he must fight to protect his friends and free the world of the yōkai from oppression. The yōkai originate in Japanese folklore and range from the cute and silly to the disturbing.