"The grueling, century-long battle royal that plunged Japan into "an Era of the Warring States" has finally ended, and the victorious Tokugawa clan rules the freshly-united Land of the Rising Sun.
Raised by the late legendary Miyamoto Musashi and mysteriously sent to the capital by him, the innocent but lethal Matsunaga Seiichiro bears a secret that is hidden even from himself: he is of the imperial family.