September 30th, 6:33 PM.
Vento of the Front, a member of God's Right Seat physically breached Academy City's third gate.
At the same time, an unknown attack was activated which caused great damage to the keepers of the peace, Anti-Skill and Judgment.
As a result of the weakened security, Vento killed three members of the board of directors.
7:02 of the same day.
Aleister, the chairman of Academy City's board of directors, determined the incomplete Imaginary Number District – Five Elements Institution would be used to stop Vento.
As rain fell on the streets in the night, the Hound Dog unit led by Kihara Amata began to move.
Their objective was the retrieval of Serial Number 20001 aka Last Order.
Kihara Amata personally attacked Accelerator as he was deemed an impediment to the plan, and the attack was a success.
That boy who was known as Academy City's strongest Level 5 was completely neutralized.
But Hound Dog made a single small mistake.
"Help…"
They had allowed a certain girl to escape.
And…
"Please, help him! says Misaka as Misaka begs you!!"
That voice reached the ears of a certain boy.