In the 24th century, intergalactic space travel has become a reality. One of the earliest outposts on the edge of the galaxy is WATCHER'S NEST, a portal powered by an inflation‑hole drive. Recently, the outpost has come under attack by a mysterious force known only as GHOUL. A group of young female cadets assigned to the portal is unexpectedly thrown into a hornet’s nest of trouble as they finalize their training to become elite pilots of the Seraphim Squadron.