The Muromachi Shogunate is weakening due to an extended war and the country has entered the tumultuous time known as the Warring States Period where blood is washed away by more blood. In the depths of the deep forests in the unexplored Kinokuni area, the Saika Ikki mercenaries are armed with guns and waving the Yatagarasu flag. Their leader is a foreigner named Magoichi. Meanwhile, a man named Saburō struggles to protect Hinomoto from European invasion. The fate of thes two will lead them both to cross swords with invaders.