God created Light and Shadow and separated them with the power of the divine Words Worth Tablet. One day, the Words Worth Tablet shall be read and all will be understood, and Light and Shadow will join and become complete. But someone has shattered the Tablet. The Tribe of Light and the Tribe of Shadow each blame the other and war ensues for 100 years. The story revolves around the bumbling but very skilled Prince Astral of the Tribe of Shadow who may be the one to bring the Tribes together and restore peace.

The skill of sword-fighting is known to two tribes, the Tribes of Light (which consists of humans living on the world’s surface) and Shadow (mostly part humans, part animals or monsters living in an underground city, who also seem to age at half the normal speed of the Light tribe). The two tribes lived in peace and harmony, their domains separated by the “Words Worth” tablet—a huge monolith slab erected by a guardian spirit. Although the tablet has writing on it, neither Tribe can read the text. One day, Words Worth was mysteriously destroyed by an unknown entity; its component parts scattered among the domain of the Tribes of Shadow.