Shiki Ryōgi is a strange girl from an ancient and influential family where mystical abilities are passed down from generation to generation. No matter the weather, she walks around in a kimono, doesn’t like talking to strangers, and for entertainment prefers taking walks through the darkest corners of night-time Tokyo. More or less only two people understand her—her employer, the cynical magician Touko Aozaki, and her only friend, the modest genius of detective work, Mikiya Kokutou. Under Touko’s careful guidance, the trio works at the Hollow Prayer agency, handling everything that brings in money—from design to supernatural crimes.