Hoshi wo Sagashite...

The story of Mio begins as you, finally having gone on holidays, arrive on the planet Ilm to see your sweetheart Laila again. Before going to her house, you decide to buy a present for her. You visit a shady foreign man's shop and buy an egg that he promises will hatch a cute pet. When Laila sees the egg, she recognizes it as a Mio egg, Mios being a rare animal that is thought to be extinct. Since you gave her the egg, it is your responsibility to find out how you keep a Mio. Still, the fact that you have a Mio egg should not be known to everyone, since scientists will be very keen to take the animal from you for purposes of their studies.