The Kamui Gaiden tells the story of Kamui, a rogue ninja who seeks freedom and escapes the constraints of the ninja world. Seeking solitude and liberty, Kamui receives help from Hanbei, portrayed by Takashi Kobayashi, a fish master. Unexpectedly, Hanbei's wife, Yuki, portrayed by Rei Dan, turns out to be his former partner. Meanwhile, the ninjas responsible for hunting Kamui are closing in on him.