From publisher blurb:
Have you ever wanted to play the lord of akingdom, but really didn't want to have to keep track of every last farmer, man-at-arms and cow in your territory? This supplement features a fast and versatile system for running your own faction.
Following a "kingdom-as-character" model, you create your clan, tribe or nation at character generatin or at any other point in the campaign. From there your faction becomes a sort of mission generator for your PCs. The noble deeds or epic failures of your characters have a direct bearing on the prosperity or doom of the clan.
Written for David Black's The Black Hack, and the Kaigaku setting specifically, this system is easy to port over to other OSR rule sets.
Also included are three brand new lesser clans for Kaigaku. Each one teaches a powerful new school. Will you be a daredevil bisento-wielding Ginjisa warrior who carves through cavalry like a hot knife through butter? A serene Inari archer who can imbue her arroews with dazzling effects? A noble Tsuma martial artist with thunder-powered kama blades who stands up for the downtrodden? It's all up to you!