In the Warring States period, lords from different countries competed with each other for the number of guns they had. In a village deep in the mountains of Izumo, where the art of tatara-blowing, an advanced iron-making technique that has remained a secret from the outside world, is the livelihood of Gosuke (Sho Aoyagi), who is destined to inherit the tatara technique passed down from one generation to the next. Since he was a child, every time his village was attacked by bandits who wanted to kill him, Gosuke wanted to become stronger and set off on a journey, saying, "I want to leave the village and become a samurai.