When Satsuki helps the music teacher move some stuff from the new school to the old one, she hears a piano playing.  When she enters the music room there's no one there.  After Fur Elise finishes playing, Satsuki tries the keys on the piano but nothing happens.  After she leaves a mysterious voices says "four more times."  Now things get strange as she must keep from hearing Fur Elise or die.  Can she and her friends find out how to defeat the ghost in time?