An orphaned girl lives at the rehabilitation facility “Muku no Sono,” where residents live communally. In reality, it is a dumping ground for girls who have committed crimes. Seeking the “secret treasure” left behind by a king of a certain nation, Shikibu infiltrates this dystopia. Awaiting her are ex-convicts, each with more than one quirk. Above all, an encounter with the most dangerous former noble lady, Charlotte Riviça, becomes the starting point of a tragedy that will shake not only the facility, but the entire world—!