Myuu and I

After the meteorite "Artemis" collapses on the moon, an unidentified phenomenon affects humans: the "Reproductive system disease". 12 years passed and mankind has done research in the field of cloning and immortality in this world where the birth rate is 0. Meanwhile, Ashiro Koshiro is still seeking the cause of this disease, and suddenly a woman appears and gives him a mysterious suitcase...