October 18th. World War III has begun. As the flames of conflict between Academy City and Russia spread further, many other countries suddenly find themselves pulled into the fight. Fiamma, the only remaining active member of God's Right Seat, attempts to control everything from the shadows while others run straight into the heart of the storm! Kamijou will travel as far as necessary to revive the magically comatose Index; Accelerator won't let even a war stop him from saving Last Order; and Hamazura must find a way to heal Takitsubo's stimulant-abused body. Though their goals are all different, it is fate that these three will cross paths in Russia, where something sinister lies in wait for them...!