Inukai Kiri, who suffers from prosopagnosia, a condition that makes it difficult for her to recognize people's faces, became a police officer under the influence of her late father, who was also a police officer, but is currently on leave due to emotional scars. One day, by chance, she apprehends a robber at a convenience store, and there she meets Saruwatari Hibiki, who has just been transferred to the Unsolved Cases Comprehensive Countermeasures Management Office (commonly known as the Mikan Room) after being forced out of the First Investigative Division for violent crimes. In exchange for not being able to recognize people's faces, Ikusui has an outstanding memory, while Saruwatari is unconventional and intuitive. The two join forces to tackle a number of mysterious, unsolved cases that have not been investigated for a long time.
