Chie, the sole daughter of the affluent Sagamiono family, enrolled in the Metropolitan Police Department Academy with aspirations of securing a suitable, ideally wealthy, husband and enhancing her social status. This decision raised eyebrows among some officers, who wondered why a girl from such a privileged background would join the police force. Her chance to graduate at the top of her class was thwarted when Yoriko achieved this position by sheer luck, setting up a rivalry between them. Chie leverages her family's financial resources to equip a modified Porsche 911 with police sirens and a radio for official use.
Their rivalry extended from catching criminals in competitions, engaging in wargames, to even competing in a Color Guard parade contest.
