Fifty years ago, there was a massive war between seven noble families that wanted to steal the throne and rule Japan. That war is what shaped the earth into what it is now. The Kozaki family got kicked out of the seven noble families and their authority got evoked by the Fukusaburu family who's the current royal family. Filled with a sense of revenge, Watanabe Kozaki decides on turning his entire family into a family of mercenaries with two goals, stay alive and destroy the royal family. This story follows one of the five children of Watanabe Kozaki, Hirako Kozaki, and his adventure to regain back his family's place at the top of the world.