Sixty years have passed since the last Ultra Warrior protected Earth.
These sixty years of peace have brought humanity unprecedented growth. Humans have established friendly relations with other peace-loving star systems, but, regrettably, they have never been able to find the home of the Ultra Warriors: the M78 Nebula.
As the older generation who saw the Ultra Warriors, and even fought alongside them, gradually passes away, the fact that the Ultra Warriors once protected Earth becomes a mere story. The fervent connection between humanity and the Ultra Warriors slowly grows cold.
A new crisis is born from this.
What will become of humanity's fate? No one knows...
