User blog comment:OnGoji/Next Ultraman Manga Project/@comment-17070698-20130917210813

To an extent yes, they are still keeping that kaiju mystery around, not explaining how they came to be, or when they roamed the earth. From what I'm reading, they only know that they are prehistoric monsters, and while they weren't vast or numerous from what the amount of fossils dugged up tell, they were one of the most powerful species to ever origin from ancient Earth.

And one of the powerful Eath originating kaiju to ever give Ultraman a beating near deaths door. So this story's universe has some involvement of the original series.