Mitsuko Asatani is a special investigator dispatched from Tokyo Police Headquarters to assist in the Cat's Eye art theft case. She is an elite officer of the Tokyo Metropolitan Police Department, known for her shrewd intellect and cunning personality. Her analytical mind allows her to see through many of Cat's Eye's tricks, and she is one of the first people to suspect that Hitomi Kisugi is the mastermind behind the thief trio. Despite her persistent investigations, she is never able to gather definitive proof. Asatani possesses formidable physical abilities: she is an expert markswoman who won the All-Japan Air Pistol Championships, holds a fourth-degree black belt in karate and a second-degree black belt in judo, and is more than a match for Hitomi in combat. She is also noted for her beauty and was crowned a beauty queen during one of the Cat's Eye cases. Her primary weakness is her severe dependence on prescription glasses; she is practically blind without them. In the manga, she harbors a secret crush on Toshio Utsumi, Hitomi's fiancé and a fellow police officer, though this is not elaborated in the anime. Her role in the story is that of a capable and determined adversary who continually challenges Cat's Eye's heists, adding a layer of intellectual and physical tension to the series. Her development sees her gradually narrowing in on the Kisugi sisters, but her inability to confirm her suspicions keeps the cat-and-mouse dynamic alive throughout the narrative.