By using the Requiem cannon against the Earth Forces' Arzachel base, Chairman Dullindal has shown that he will destroy anyone who stands in the way of his Destiny Plan, and it is clear to all that Orb is his next target. The Orb space fleet and its allies scramble to attack the Daedalus base before Requiem can fire again, while the Archangel and Eternal attempt to destroy the cannon's first relay station.

In preparation for the final conflict, Dullindal summons Shinn and Rey to join him at the mobile fortress Messiah. Meanwhile, he sends the Minerva and most of ZAFT's lunar orbital fleet to intercept the Archangel and Eternal, Kira and Athrun, with the help of Yzak and Dearka, finally succeeds in destroying the cannon’s first relay station. must decide whether their loyalties lie with ZAFT or with their old comrade Athrun.