On the Hokkaido frontier, a war veteran and Ainu girl race against misfits and military renegades to find treasure mapped out on tattooed outlaws.

As each group pursues their mission, a fierce battle unfolds over the tattooed prisoners. Who is friend, and who is foe? The fight leads them all to Abashiri Prison, where Noppera-bo, the man who holds all the answers, is locked away...