Mahou Shoujo Rina

The second Magical Story Series game is not connected to the predecessor story-wise, but has a similar premise. The heroine this time is a little girl named Rina, who has a crush on an older boy, whose name is Tatsuya. One night she sees a falling star and wishes to be a grown-up young woman. Miraculously, her wish is fulfilled; but the falling star is revealed to contain a mischievous imp, who grants Rina an ability to grow up and return to her normal self, as well as assume the appearance of other people...

[From Moby Games]