This cover brings images of the rioters in Akira to my mind. My idea is that the player is an operative trying to take out key buildings during a city-wide riot / protest. You have to move through the city by blending in with the stream of protesters. Once you get to a target building, the game turns into a stealth game as you sneak past police, guard dogs, cameras and regular citizens in order to place explosives on the building's supports. Then you have a limited time to get back out before the building blows so that you can get to the next location. Oh yeah, and you're armed only with an infinite supply of maltov cocktails and a baseball bat.
I'm thinking this game is a little to ambitious for this competition though....