The game begins with your character, whose family has just moved to the area, entering his new school for the first time. After class, you accidentially run into a conservative-looking girl wearing glasses. She introduces herself as Mizuho, but you can't help but notice her striking resemblance to your dream pop idol Cher (I mean Miho, of course). You pick up a good-luck charm Mizuho dropped to give back to her, then make a startling revelation - your photographer brother took a picture of Miho carrying the exact same charm!
You go to the music room to confront her with this evidence - and this is where the true challenge of the game begins.

from http://www.atarihq.com/tsr/fds/miho.html