In the early 21st century, Earth faces a threat from giant comets. In response, the United Nations establishes the Cosmic Emergency Management Agency (CEMA) and implements a two-part defense program. Spacecraft launch from orbital stations to fire specialized missiles that intercept and break up the threatening celestial objects, while fighter jets on Earth handle the remaining fragments. Competition among pilots is fierce, as everyone aims to become one of the highly regarded Comet Blasters in space rather than a Meteor Sweeper on airbases. Despite coming from an esteemed lineage of pilots, recruit Mikaze Honjou finds the path to becoming a Comet Blaster arduous, which leads her to neglect her studies. However, after a successful mission with her friends—Karin Kikuhara, Shizuha Doi, and Ayamo Nakamura—Mikaze rediscovers her motivation and sets out to complete the training alongside the others.