It is the twilight of the shogunate in Japan--the Bakumatsu--a time of tumult in which ruffians from all walks of life vie for supremacy. Hanagusuku Muta, a Ryukyuan boy from a disgraced clan of nobles, now lives in poverty, stealing just to survive. But one day, he hears rumors of a massive cache of treasure left by a legendary pirate on a small island in the kingdom, one valuable enough to throw all of Japan into disarray. After getting framed for a crime he didn't commit by a group of Satsuma samurai, Muta gets dragged into the vigorous, bloody struggle for the treasure...!!