Far from the front lines of the war between humanity and the Demon Lord, an incident occurs in a remote region where an entire town is turned to stone. To investigate the cause, the Adventurers’ Guild dispatches two elite operatives: an elder sister who is a Saint, and her younger sister, a master dual-blade wielder. The younger sister, Rui, possesses a unique skill that causes her sensitivity to increase the more damage she takes. One day, after suffering a critical injury, her overly sharpened senses spiral out of control— and despite being on the brink of death, she is overwhelmed by an unimaginable surge of sensation…