2112; the summer before Akane Tsunemori was assigned to Criminal Investigation Department. Teppei Sugo, an accomplished pilot of the Defense Army, joins the military operation in Okinawa. Three months later, an unmanned combat drone opens fire on the Ministry of Defense in Tokyo. Enforcer Tomomi Masaoka is dispatched to Sugo's military base to investigate the truth behind this case.

Na luta para defender Atena e colocá-la em seu lugar de direito, os Cavaleiros de Bronze lutam para superar o Mestre do Santuário e os poderosos Cavaleiros de Ouro, guardiões das 12 casas.