At the southern end of the Osean continent lies the "Federal Republic of Aurelia". Rich in resources, the citizens of Aurelia enjoyed an era of peace and prosperity. That is, until the surprise attack by the neighboring "Peoples Republic of Leasath".

Taking advantage of its heretofore ally's undermanned defenses, Leasath forces quickly brought down Aurelia's border, advancing into Aurelia with the power of a killer tsunami. Aurelian border cities had no choice but to surrender their authority to the invading forces.

Threat of Leasath air attack has extended to the "Phuku Lagolla" air base located in the southwest corner of the coastal Aurelian capital city, Griswall. Phuku Lagolla headquarters orders its experimental flight technology evaluation squadron "Falco", to ambush Leasath's incoming aerial forces.

A portion of Aurelian front line defenses have collapsed under the pressure of ongoing Leasath attacks. Planting a foothold beyond the gap created, Leasath ground forces' have begun the main phase of their invasion....