Twin avatars, a boy and a girl, were born to reincarnate the gods of light Kujakuou and god of darkness Tenjaou. The Boy, Akira, is a member of a Buddhist sect charged with guardian the Dragon Grail, a mysterious vessel that has the power to release Tenjaou into the world. Power crazy neo-Nazi Siegfried von Mittgard plans to steal the grail and reincarnate himself as Tenjaou; this will prevent Akira's twin, Tomoko, from fulfilling her destiny, but Siegfried has another role in mind for her.

Source: The Anime Encyclopedia

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Alternative version: Kujakuou