June, 1565: Master ninja Hiro Hattori receives a pre-dawn visit from Kazu, a fellow shinobi working undercover at the shogunate. Hours before, the shogun''s cousin, Saburo, was stabbed to death in the shogun's palace. The murder weapon: Kazu's personal dagger. Kazu says he's innocent, and begs for Hiro's help, but his story gives Hiro reason to doubt the young shinobi's claims.