[A Certain Magical Index fanfiction + derivative work + ensemble cast + not a wish-fulfillment story]
To all that changes in an instant.
October 8, with Independence Day approaching and much of the military deployed elsewhere, Academy City's defenses had never been so weak. The city was as peaceful as ever, but many people could no longer sit still! They longed to do something to Academy City, just as it had done to them. And as it happened, they had the means: Academy City had given them those, too.
“Wouldn't it be better if this city could become better / were not the way it is now / didn't exist at all?”