The game is a strategy game in which an all-female elite force helps defend their homeworld, Omni, which is seeking it independence from Earth, using a variety of mecha-based weapons.
In the year 2535, planet Omni entered independence war against planet Earth government for land dispute. Facing the overwhelming Earth forces, Omni government converted the pioneering Power Loader (PLD) units into walking combat machines. In 2540, the third team of 177th squadron, an all-female combat group named DoLLS (Detachment of Limited Line Service) has seen deployment.
In the game, player takes control of that combat group over nine missions.