After surviving a fall into a volcano, the Peace Force comes across an injured Sanada Ninja who offers to help battle his former allies.

As Kenshin learns of a battle between the Wind and Water families for control of the Ki, efforts to build a railroad are exposed as a Water clan plot to control Japan.

With Kenshin's help, the Wind family derails their rival's plan to redirect the flow of the Ki and ends their effort to dominate Japan.