The only daughter of the rich Sagamiono family, Chie entered the Metropolitan Police Department Academy in hopes of winning a suitable, preferably rich, husband and making herself a bit more popular to society, earning questions from some of the officers as to why a rich girl would join the police force. She had lost her chance to graduate on top of her class when Yoriko earned it via luck, marking her as Chie's rival. She uses her family's financial position to use a modified Porsche 911 outfitted with sirens and a radio for police use.
The two had been at odds with each other from catching crooks in a contest, to playing wargames to a Color Guard parade contest.

(Source: Wikipedia)