C.M.B. (manga)

 is a Japanese manga series written and illustrated by Motohiro Katou. It was serialized in Kodansha's "Monthly Shōnen Magazine" from 2005 to 2020. Kodansha collected its chapters in forty-five "tankōbon" volumes, released from March 16, 2006 to October 16, 2020.
It is a companion work of the "Q.E.D." manga. The story revolves around the detective Shinra as he solves mystery cases related to murder, fraud, etc. along with his classmate Tatsuki. It sometime features characters from Q.E.D. as a crossover special.
Synopsis.
Shinra Sakaki who inherited three rings of Wise Magi became acquaintance of Tatsuki Nanase by awkward case. Since then, Sakaki and Nanase get involved several abnormal incidents to solve trouble-making-problems behalf of other people around who requested their assistant, such as Inspector Kujirajaki.