4001 A.D. -- Tohru Nakadai is the 42nd Rai, the spirit guardian ofJapan. Infused with the energy of his ancestors and dedicated to the way of thesamurai, Rai is sworn to the service of Grandmother -- the personified, artificial intelligence that governs the island nation of Japan. For fortygenerations, Grandmother's benevolent dominion has endured, but in the wake ofher sudden disappearance, Rai will become all that stands between his nation andall-out...