During the Sengoku Period (1579), a young woman who has lost everything dedicates herself to seeking strength and a death on the battlefield. Reiri once lived happily with her family until soldiers arrived in the village after a battle. Her father, mother, and brother sacrificed themselves so that she could survive. She was saved only through the intervention of Okabe Tanba-no-Kami, who had been taking shelter in the village. In his service, she grew up and learned to fight well, pursuing her goal of dying in battle. However, her path to death may not be as short and direct as she hopes.