Ризуму Ниономия

Изуму's younger twin sister, self-proclaimed "Great Detective". She prefers restrained clothing in the form of a black cloak. She forgets to eat and often faints. Her specialty is field investigations, and she lacks special abilities. Her psychological age is 16, while physically she is developed at 22 years old. She gives the impression of a completely innocent person, but she wears a straitjacket. She has a beloved one. She is a former member of the "Thirteen Steps".