An undefeated warrior dies peacefully in bed, regretting that she never met a foe strong enough to beat her. When a sickly young girl named Nia Liston lies near death, her desperate parents turn to a hooded stranger who claims he can save her. Instead, he places the dead hero's soul inside the child's frail body. Given a second life, Nia sets out to rebuild her strength, using chi to root out the illness at its source. Her hunger for combat has come with her, and her search for a worthy opponent stirs up chaos wherever she goes.