During the Warring States era, the feuding generals were suddenly struck down one after another by the demonic Kishin. In the 150 years since, groups of individuals have continued to resist Kishin control. They are called Bushi bands. When they were young, Musashi and Kojiro would hear tales about the Bushi from Kojiro's father, and the two of them dream to form the strongest Bushi band. One day, as Musashi struggles with his choices, he witnesses humans being torn apart by oni. Forced to face the truth, Musashi rises up against the powerful oni to make his dream with Kojiro come true!
Esen, a young man who has been expelled from his village, escapes with the daughter of one of the most powerful men in the village. Whilst being pursued, he is forced to fight for her hand in a battle that results in the destruction of a sacred totem tree. This puts the whole village in jeopardy, and it is up to Esen to redeem himself and save them all.