After the conclusive battle in Yamato Takeru, three years have elapsed and serenity has been restored to the land. Takeru, Oto, and their companions are enjoying peaceful days in their village until one fateful night when Shuranoo, controlled by Mikazuchi, suddenly reappears and wreaks havoc. Takeru has no other option but to awaken the dormant Susanoo and confront the imminent threat. However, this is only the prelude to a fresh peril, and Takeru must conquer his inner demons to save Oto from danger.