After the problems Miharu Oozora encountered with her Comet Blasters, the Cosmic Emergency Management Agency (CEMA) concludes that it can no longer fully depend on human pilots for interception missions. Consequently, an outdated program utilizing unmanned shuttlecraft is brought back for testing. At the same time, on Shimoji Island, Mikaze and her friends finally sit for their pilot licensing exam as a new group of rookies arrives at the base. The situation escalates rapidly when one of the orbital stations nearly fails, necessitating a spontaneous rescue operation. As CEMA fractures internally over how to manage the crisis, the broader mystery concerning the comets starts to come to light.