Minamoto Yoshitune is a young samurai who has ventured into the heart of Edo. While there, he soon discovers that beings out of myth are walking the streets. After a world-weary Tengu saves his life, Yoshitsune and Tomiko discover that a timeless evil is gathering its strength. They two become involved with the centuries old plotting of the villianous Naga and the fate of the Tokugawa Shogunate and all of Japan is at stake.