In the middle of the Edo period, there was a person with a keen eye. The Ronin called himself "Soldier" and belonged to no one, but was a fierce swordsman who faced evil by following his anger against injustice. When he gets involved in various incidents, he draws a lonely hero image that stands up without bending his own policy.

A full-fledged action historical drama from the unique duo of Kazuo Koike, of Lone Wolf and Cub, and Ken Tsukikage.