Agata is badly ill and nobody knows how to cure her. No doctor can help. Friends of Agata learn, that she is ill, because all children have Grannies but Agata does not. They go to the shop "Electronic Granny" and beg the dealer to sell them one Electronic Granny. The dealer warns them, that her electronic circuits are very sensitive - and this Granny will only work if loved. Agata get healthy and plays with her new Granny and other friends. Granny can invite new games and even fly with all children to the Moon. But later due to the jealousy and bad heabits children forget that they must love Granny, they begin to treat her just as a robot that "must do what they ask". As a result Granny dies. To resurect her Agata and friends must get off their ambitions, rudeness, jealousy and again become loving, cheerful and kind.