Her classmates at school called her Key... as in the 'key' to a strange mystery. A waiflike robot-girl with no emotions, Key was left behind when her kindly old scientist 'grandfather' passed away, without even a way to learn how to smile. But a message left for Key suggests a fantastic possiblity... Could it somehow be possible for Key to become a real, live human, if she can only win the love of 30,000 friends?