Shinobi Ryu (PDF)
The 64-page book Includes a detailed history and description of a number of historical shinobi (aka "ninja") ryu or clans, NPC write-ups, and a sample shinobi village.
Shinobi Ryu contains additional information for both GMs and players, including:
New Ryu (clans)!
New Shinobi Profession Templates!
A Shinobi Village, with full-page map and key!
Visit Sengoku.com for additional info and game support!