From MF Books! A boy named Rio, living in a remote village, is disappointed with his village dojo's teaching methods and quits. However, to survive in the dangerous frontier, he needs some martial arts. So, Rio begins to create his own unique swordsmanship. Despite being told he's talentless, Rio becomes engrossed in creating his swordsmanship, even completing an ultimate technique. Little does he know that this technique will change the world.