High school student Kirigamine Ryo (Kawaguchi Haruna) is the vice president of the detective club at Koigakubo Academy, a school on the outskirts of Tokyo’s Kokubunji. Posing as a famous detective, she makes deductions to solve various cases that occur within the school. But because her deductions are flawed, she never solves the cases. She is helped by her biology teacher Ishizaki Hiromi (Hayami Mokomichi), detectives and suspects, as the cases are solved.
Kawaguchi Haruna as Kirigamine Ryo
Hayami Mokomichi as Ishizaki Hiromi