Misaki Kirihara Friends

A Contractor who has the ability to cover his body with whatever material he touches.

Head of the 2nd Investigate Division of the MIAC's Statistics Bureau.

Codename "Hei", the main protagonist, is an elite Contractor, with the Messier Code BK-201. Hei has a double persona in the series. In the general public he is referred to as Li Shengshun, a good-natured Chinese exchange student living in the Umitsuki apartments.

Chief of observatory and Kirihara's friend.

Kunio Matsumoto is the oldest member of Section 4 of the Tokyo Police Department.

Mayu Otsuka is Section 4's liaison officer with the Astronomy Bureau.

Superintendent supervisor and a head of security at the National Police Agency. He is father of Misaki Kirihara.

Yusuke Saito is a police detective in the series Darker Than Black.