Kondo serves as a member of the Tokyo police force's Ex-Arm Countermeasure Division. His background includes specialized military training as an exoskeleton soldier with the United States Army and prior service in Japan's National Defense Force as a sniper within the Special Security Assault Team (S.S.A.T.). This special operations experience directly informs his tactical capabilities within the division, where he leverages his sniper specialization.

During the Reconstruction Committee's raid on the division headquarters, Kondo participated in defensive operations alongside his colleague Kimura. In the manga adaptation, a villainous priest later uses an Ex-Arm's ability to brainwash Kimura into perceiving Kondo as evil, creating significant conflict between them; this storyline does not appear in the anime. Kondo's background as a special operations soldier continues to define his role in confronting Ex-Arm threats.