Ronin

Highmoon Games builds on its specialty in historicaly-based RPG materials with the release of Ronin: Oriental Adventures in Tokugawa Japan. This is a 136 page PDF supplement for the d20 system. Unlike many other such books that employ an asian style in developing an imaginary setting, Ronin gives you the tools for building campaigns in Japan during the Edo period (plus a little magic to account for legends).