Stranded in a parallel world, Kazuki searches for the injured pilot, Yayoi, but finds she’s been taken by UN forces. Returning to his home, he’s shocked to find his parents don’t recognize him and his belongings are gone. Captured by soldiers led by Mitsuki, Kazuki learns he doesn’t exist in this reality. Ken Sanada, a UN Global Defense Force leader, reveals Mitsuki arrived a month earlier and is a core robot pilot fighting the Rara army, led by scientist Hiroshi Rara. As Kazuki grapples with his displacement, he faces the reality of a world at war.