Facing an Improper Giantess, I Can Only Rely on My Wife

(This is an honest synopsis, and it goes more or less like this:)

1: Ye Feng transmigrates to another world with spatial abilities.

2: His space contains huge quantities of supplies and scientists from many fields.

3: This world is ruled by giant women. The giant men have all been killed, and how the giant women reproduce is a mystery.

4: He gets a System after transmigrating, but it can only be activated after he gets married.

5: Ordinary humans have not completely disappeared. Protected by a mysterious force, they live in a safe zone and lead lives like primitive people.

6: Their population is fewer than 50,000, their resources are about to run out, and their species is on the verge of extinction.

7: A prophecy says Ye Feng is a savior.

8: Ye Feng is ordered by "a certain being" to help the human empress reclaim her throne and establish a civilization.