Any other fans of this in here? It seems to have a passionate following of the people that have heard of it before. I went into it blind due to good ratings on MAL and lived it right away.
It follows an ex soldier and an indigenous girl in Hokkaido. They're after a lost fortune in gold, and they only clues are contained in the mysterious tattoos of a group of escaped killers.
Also after the treasure is a rogue group of soldiers and a band of martial artists, along with some of the other killers, mob bosses, and others.
You get to learn a lot of week researched facts about the native people and their customs, history of Hokkaido and Sakhalin. And to lighten the mood, there are a ton of if gags, slapstick, sex and toilet humor, whacky versions of historical figures, and some occasional random sexy/funny male fan service. It has it all!
And fear not! The manga is complete and the last season of anime which has been simul-dubbed is in production of the final season, so it's ready for anyone to dive in.