A rupture in the sky connects two parallel Earths, one ravaged by endless kaiju warfare, the other struggling to hold the line. As elite pilots of the Aozora Defense Corps scramble to contain the escalating threat, squadron leader Misaki Hoshino comes face to face with her counterpart from the other side, a hardened pilot shaped by a world that never knew peace. With monsters crossing between realities, the two Misakis must choose: remain divided by fate or stand together to defend the last blue sky.