During the Warring States era, Hozoin Kakuzenbo and Yagyu Tajima-no-kami, being best friends, spend their days acquiring skills of the spear, sword and martial arts. Hozoin loses a series of matches with master swordsman Kozumi Ise-no-kami. Bitterly ashamed, Hozoin embarks on a journey, trying to perfect his skills. A few years later, Hozoin is ready and it's time for the ultimate showdown with Ise-no-kami!