A special investigator sent in from Tokyo Police HQ to assist in the Cat’s Eye investigations. Asatani has a very shrewd intellect and has a very cunning personality, and is considered an elite officer of the Tokyo Metropolitan Police Department. She is an expert markswoman (won the All-Japan Air Pistol Championships) and is proficient in several martial art forms, she's a 4th-degree black belt in karate and 2nd degree black belt in judo, making her more than a match for Hitomi. She is also quite a beauty, even being crowned a beauty queen during one of the Cat’s Eye cases. She is one of the first person to suspect Hitomi as the true identity of Cat's Eye, but is never able to find definitive proof. Her main weakness is that she must wear prescription glasses all the time, as she is practically blind without them.

While never really elaborated in the TV series, in the manga she is said to have a secret crush on Toshio, much to the chagrin of Hitomi.

(Source: Wikipedia)