The E.U. army forms a special team consisting of Elevens, exiled Japanese who had their country occupied by Britannia, known as the W-0 Unit.

The new members of the W-0 unit attempt to desert, but this is prevented by Akito and Leila; Suzaku Kururugi and Julius Kingsley have arrived in St. Petersburg from the Britannian mainland.

After the W-0 unit is denied access to head back to headquarters, they come across a group of elder gypsies who temporarily take them in; Akito and Leila reveal what happened when they were children and thus leading them to where they are now.

While W-0 is away, Leila and the remaining crew at base find themselves surrounded by Britannian Knightmares; Piloting the Vercingetorix, Shin Hyuuga leads the enemy charge, having usurped the position of Grand Master in the Knights of St. Michael.

As the remaining forces of the Knights of St. Michael regroup in order to launch a final assault on Castle Weisswolf, the W-0, along with their new ally Ashley Ashra, stand ready to intercept them.