Unabara Domain—home to nightmarishly strong students and masters of martial arts of all kinds. The lord of the Unabara has decided that whichever of his sons discovers the strongest martial arts style will be his heir, but when 28th son Naoyoshi Washizu decides on Ogama-style practitioner Gama Kurogane, son of notorious father and scion of a “weak” style, to represent him, the odds seem bleak. But between Naoyoshi’s determination and Gama’s hard-earned strength, they may yet come out on top!
After Gama and the others breach Unabara Castle gates, they find a place to hide and regroup, however Zenmaru can’t help but toil over his own lack of ability. He goes off looking for enemies in order to become stronger, only to be attacked by one of the strongest of all Muho style warriors, Kiyomori Yamanoue! Faced with an opponent clearly out of his league, Zenmaru must draw his colossal sword, the Sadanaga! The true payoff of Zenmaru’s year-long training will finally be put to the test!