A group of people live a quiet yet fulfilling life in their small town. Little do they know that their peace is an artificial illusion. In reality...the earth has already fallen... Unknown alien organisms, dubbed “Dractors”, have wiped out 99.9% of all human beings, opened a gaping hole in the planet, and terraformed it to suit their needs. The remnants of humanity had no choice but to flee and conceal themselves within shelters. They now live out their lives never knowing which day will be their last...

Memories of the Day of Destruction have been erased from all residents of Shelter Kushia. They have no idea what has transpired outside their peaceful bubble. However, a chosen few pilot giant mechs called “Rouge” and lead the battle against the alien race. Today, a new pilot will be chosen...