It was 1969.
Strange "living vehicles" appeared out of nowhere and started conquering nations.
Overwhelmed, the people fought back, but we lost out.
Jipang, the "land of the arousing daughter", had few resources
But was succeeded in creating a system
Huge amounts of firepower. There was one caveat:
The system was perversely limited to use by young girls.
Two candidates were inducted into the system and unleashed on the enemy.