In the year 2014, a high school student who hates machines, Akira Natsume, wants to change himself for the better and tries to take the first step in doing that… But then he gets run over by a truck. Fast forward to 2030. A police officer named Minami Uezono and her partner, the android Alma, infiltrate the scene of a trade going on at Tokyo Harbor for an unknown weapon named “EX-ARM.”

They are then attacked by an enemy armed with the “EX-ARM” No.08. Put in this life or death situation, they decide to activate the “EX -ARM” No.00 that they stole from the enemy, and….