In a Japan overrun by demons and monsters during the Warring States period, a man named Higashino Sora, armed with only his katanas, faces an eight-armed demon. He states that "There is no eight-sword style in the way of the sword." The demon retorts that victory is all that matters. Higashino Sora's path to mastering the sword is intertwined with his unexpected role as the master of countless yokai. He dreams of pursuing the ultimate way of the sword, while his family status is that of the master of hundreds of ghosts.