Morning Musume。 has its own game on the iTunes Store.
The picture of Morning Musume。 face morphs into from one member to another. Touch exactly each member's "pure" face and complete eight Morning Musume。 member faces!
Here is the link to download this application, for 1.99$
PS: If you do not own an American account, then search through the iTunes store of your country the keywords "morning musume".