Shinomiya Komachi

An officer in the traffic division, Komachi is bright, witty, and a sucker for a handsome face. Her father is a senior police commissioner.

She's a seasoned organizer and attender of weekend mixers, through which she has a wide web of personal connections.

She ends up looking after Ruka with some frequency, if not always entirely voluntarily.
The two once cooperated on an undercover investigation.