6 Inch My Darling (1998)

You play a high school student living with your parents and younger sister. On your way back from school, you stumble across a mysterious wooden box containing a strange figurine and an old letter. Thus your adventure begins...

Basically, this is a dating game, where you get to chaperone one of three 6-inch tall fairies from another world as they go about exploring your world (and sometimes making quite a mess while they're at it). Depending on how you do, you unlock various scenes/events throughout the game and maybe get a happy ending with the girl of your dreams. Along the way, you'll also be juggling your unsuspecting family and friends, including a real life female classmate who might turn out to be a love interest as well if you play your cards right.