A girl who was sold to the lowest class brothel sees the hell of this world! Chinu is a lively young girl born and raised on Inoshima Island in the Seto Inland Sea in the late Meiji period. She had no mother, but lived with her father and her beautiful older sister, Sayori, since she was a child. One day, their father dies, and the sisters are put up for auction. Sayori was sold to a pedant for a high price, and Chinu was sold to Sugaya, a low-class brothel. Chinu hopes that if she lives, she will someday meet her sister....