A "kamuro" is a young girl who cares for a courtesan and runs various errands for her, while simultaneously studying the art herself. The custom of kamuro referring to their respective courtesans as "big sister" gave rise to the term "oiran," which denotes the most elite courtesans in Edo-era Japan. This story is set in a brothel named Shinkiro, located in the notorious Yoshiwara red-light district, and features an oiran widely known as the "Courtesan from Hell," a highly popular sadist specialist named Hashidate. Her personal kamuro, Namiji, narrates the tale, presenting a portrait of Hashidate that most would never anticipate. A diverse array of customers, including townsfolk, samurai, and high-rollers, appear in full force as Namiji recounts these fantastic stories!