Besides being a gyaru, Kotobuki is also from a family of police. Her dad is a police chief, her mom is a policewoman, her older brother is stationed at a police box and her younger sister wants to be a detective. Ran herself appears uninterested in joining the police though. This is mainly because she’ll:
So it’s a lose-lose situation in her mind.
She had terrible luck with guys at first, but eventually starts dating Tatsukichi.