Hamazura desperately tries to rescue Takitsubo when the building she is in falls under terrorist attack. Stephanie hunts down Kinuhata to exact revenge for Sunazara. Accelerator seeks out assistance from an unlikely benefactor.
Accelerator continues on his way to the satellite control center, but is blocked by Saraku, a MEMBER agent. The BLOCK team, with the help of 5000 hired mercenaries, attempts to break into a heavily-fortified municipal facility.
Kamijo runs into Sasha Kruezhev, and he continues to formulate a plan to stop Fiamma. Hamazura and Takitsubo discover an imminent threat to Digurv's village. The archangel Gabriel rains havoc upon the Russian and Academy City forces.
After dealing with the sorcerers at the Russian airbase, Accelerator has a Misaka clone skydive down to confront him. Vento challenges Fiamma while Kamijo and the others watch on. Hamazura gets some disturbing news from Digurv.
As Kamijo and Sasha look on, Hyoka rushes in to stop the archangel's rampage. Accelerator joins the battle as well, with a newfound purpose. Acqua has his own strategy to weaken the archangel's power, though at great cost to himself.
Tsuchimikado's location spell backfires and leads Oriana straight to him, causing an epic showdown. But he's not the only one feeling the force of Oriana's magic: Himegami feels for force of the spell caster's power, and may not survive.
Confronted by Terra, Kamijo and Itsuwa have their hands full trying to avoid his attacks. Military forces from Academy City appear in Avignon, suppressing the demonstrators. Terra uncovers the secret Kamijo has been hiding.
Kamijo begins second-guessing himself after Fiamma's rebuke. Hamazura fights to protect the village from privateers. The fighting between Britain and France ramps up. Accelerator lashes out at Kamijo over Last Order's condition.
Kazakiri advises Accelerator about the song Index once sang to treat Last Order. Hamazura has a surprise encounter. Lessar offers a proposition to Sasha. The long-awaited showdown between Kamijo and Fiamma takes a drastic turn.
Técpatl and Unabara square off in Shiokishi's chambers, while Accelerator and Sugitani face each other in the hallway outside. Kinuhata discovers the true reason for the current assault against herself, Takitsubo, and Hamazura.