It turned out that the Bose Alliance and the Fermi Alliance had almost simultaneously discovered the existence of the Heavenly Nebula.
However, the Fermi Civilization had taken a step ahead and ventured into the Heavenly Nebula to investigate, unexpectedly discovering a number of native civilizations — that is, civilizations born and evolved within the Heavenly Nebula, much like the indigenous people discovered by Earth Civilization during the Age of Exploration on some new continent, the same concept.
At that time, the Fermi Alliance intended to subjugate these native civilizations to naturally become the rulers of the Heavenly Nebula.
However, just as the Fermi Alliance successfully subdued the native civilizations and were returning home, the Bose Alliance, not wanting to be passively positioned in the struggle for the Heavenly Nebula, executed a raid plan, annihilating all the native civilizations subdued by the Fermi Alliance.
