Blue Star, a hundred years ago when aliens invaded, countless secret realms appeared in Blue Star. Various alien races appeared in the secret realms to attack humans. Because of the appearance of secret realms, Blue Star also had spiritual energy to support the Su. Humanity gradually developed various super powers. The humans who were passively beaten also relied on super powers to fight back. Later, five superpowers awakened SSS-level powers and led the humans to push the alien races back into the secret realm.
Since then, the battlefield has moved from Blue Star to various secret realms...
It's a bit like that one where I have 999 powers