Mid-Edo era. A region has become the preferred gathering place for martial arts enthusiasts. The name of this region is Unabara, "The Landmark of Demons". Washitzu Naosata, the lord of Unabara, decided to organize a gigantic martial arts competition to find out who is the strongest. The one of his 31 sons who knows how to find the strongest martial arts expert will become his successor. Washitzu Naoyoshi, the lord's 27th son, goes in search of the legendary Kurogane Jinsuke, said to be capable of massacring 1000 martial arts followers. But Kurogane Jinsuke seems to have disappeared and Naoyoshi goes to meet Gama, the last student of the Ogame school. It is ultimately Gama who will accompany the 27th son of the lord of Unabara to the Great Competition. A story full of promise and fights.