I just realized something.
In one of the last chapters we've seen those weird monsters attacking shibuya take human form.
And when Kaname was stuck on that Island with the villager guys (you know, the world with the old GM that died and the monkey monsters) , one of them told him the doume overthrew all other humans. So basically... in that parallel world, humanity probably 'lost', either getting overtaken or infiltrated with the old GM being politically outmaneuvered and japan getting trashed by monsters.
The mural we've seen is probably a prediction for every world shown so far, then. In the world of the old GM it already happened, in Kanames it's currently happening, in this one it will one day happen.