When fire was first discovered, humans were intimidated by its might. But, as they grew more skillful in managing it, they harnessed its power to melt iron and produce impactful weapons. This fresh understanding empowered them to gain power and enter into battles, which, in turn, resulted in their dominance over each other. Join Akoya, a sheltered young woman under the protection of a mountain god, as she navigates life in pre-samurai Japan, fighting for survival.