From the official game website:
Who is humanity’s true enemy?
Binary Domain is an original squad-based shooter by Toshihiro Nagoshi, the creator behind some of SEGA’s most well-known video game franchises, including the critically acclaimed Yakuza series. Binary Domain puts players in the middle of a fast paced and intense battle for humanity in a robot-invaded 2080 Tokyo. Fighting through the derelict lower levels of the city, players control an international peace-keeping squad that soon starts to question their surroundings and the choices they make. Are the robots becoming more human, or are humans becoming more like machines?