Classmates at school simply call Mima Tokiko Key... as in the 'key' to a strange mystery. The waif-like android-girl without emotions was left behind when her kindly old scientist 'grandfather', Mima Murao, passed away, without a way to learn how to smile. But a message for Key suggests a fantastic possibility... Could there be a way for her to become a real human, by winning the love of 30,000 friends?
