One month after the massive terrorist attack by the "Cornerstone of the New World", spring is about to arrive. Volt and his friends are finally enjoying their newfound normal, and the time has come for them to start focusing on their own paths. But then, Volt is put on the international wanted list! Upon learning the shocking news, Sora and his friends begin to chase after Volt, who is desperately trying to escape... Another Earth appears in the sky, a dog who claims to be the successor of the "Cornerstone", and the mysterious Shepard. A great plan is in motion. Volt Steiner's final ordeal.