Intergalactic Space Travel has now become a reality in the 24th Century. Among the earliest space posts in the farthest districts is WATCHER'S NEST, an inflation hole drive portal. However, this station is now under a sudden assault from an enigmatic entity named GHOUL. As a result, a collection of young female cadets assigned at the hub are caught off guard and are plunged into a chaotic situation in the midst of their final pilot training to join the prestigious Seraphim Squadron.