Clockwork Planet

In order to demagnetize the Akihabara Grid, Marie and Naoto decide to take over the Pillar of Heaven, which is the center of all the grids in Japan. With the help of a weapon housing Halter's mind, they overrun the Sakuradamon Grid and take Souko Hoshinomiya hostage. They then make a big announcement, but what's the aim behind that?