Chacha Kimihara is a rookie police officer of the Ruruie Metropolitan Police Department. Chacha is first seen in Murciélago Volume 1, Chapter 3: The Bad Day and has made several appearances in nine subsequent arcs, making her a major supporting character in the Murciélago series. Chacha has quite a small stature compared to the other women in the cast and she is almost always accompanied by her mentor: Tougo Mitsurugi. She has also hired professional sniper Reiko Kuchiba as her assassin.