And epic sci-fi story heavily influenced by the Epic of Gilgamesh, as several groups fight for a mysterious power. While a close bother and sister get tied up into the battle unwillingly.

Three generations of "Kage" ninja in the employ of Mitsunari Ishida, and the mysterious events that unfold around the Kanei Gozen match held in front of Shogun Iemitsu with Munenori Yagyu and Tadatsune Ono as referees. What exactly are the mother and son "shadows" up to?