A long time ago, after the death of Emperor Nakatomi Shigeaki without an heir, the Eastern Empire disintegrated and fell into turbulent times. The political power of the empire was held by a series of military dictators and feudal lords known as the Shoguns and Daimyos. The Shoguns and Daimyos slaughtered each other, leaving the once prosperous land in the region covered in blood for hundreds of years. At the most crucial moment of the war, Sakura, an elite assassin of the Nagasawa clan, betrayed her clan. She sought the power of darkness from the Darkness Titan Kilgranuth with the desire to end the civil war and unite all the clans into a new empire under her