Blood: Path of the Shinobi Quick-Start Primer

From the introduction:

Blood is a stripped down, complete-but-concise, RPG. The focus is on characters and the storyline, not on statistics and technicalities. The system is simple and fluid, and is designed to be easy enough for gamers of all experience levels to easily pick up ... With an emphasis on world-immersion, the system and mechanics take a backseat to the story and the characters. We like to use a term called “the elastic world”, which is to say that the boundaries of this world are not carved in stone. They can stretch and be molded to whatever fits your group of players.