Enter Little Sister

Where was she?

 ...

Swimming within Mother Kim's fluids, the young girl seemed to have sensed her situation.

Eh?

Was she about to be delivered?

Then, didn't that mean that she died on her mission against the Bordous?

That's right.

She was from another world and frankly speaking, another era.

She came from a time similar to the Stone Age, which was way before the Bronze age, and also far away from the Iron age.

The bronze age was when copper, tin and other alloys were discovered and put to use... And of course, the Iron age was self-explanatory.

But she came from the stone age, all before this.

And during this age of man, the tribe chiefs and important clan members created a gluing paste and realized that they could build Stone homes and move out of their wooden ones.

This was perfect since their homes were permanently getting destroyed by massive beasts of all sorts.