The story is about
Demetan (
Jonathan in the English version), a poor young
frog living in Rainbow Pond with his mother and father (a toymaker), who becomes friends with a popular and sweet girl frog named
Ranatan (known as
Pookie and later
Hilary in different English versions), despite the differences in their social standings: Ranatan is the daughter of the leader of Rainbow Pond (English name,
Leopold), while Demetan and his parents are
tree frogs, which make them automatic outcasts in the community. Together, Demetan and Ranatan enjoy many adventures. Like many of Tatsunoko's series at the time (in particular its predecessor
Kashi no Ki Mokku), the show was often sad, tragic and even
sadistic, with Demetan having to deal with natural
predators as well as the
bullies who rule the
pond. The well-loved theme song sung by
Mitsuko Horie has a melancholy sound. In addition to its original broadcast on
Fuji TV in 1973,
Kerokko Demetan was re-run on
TV Tokyo in 1982, as a replacement for
Don Dracula, which was pulled off the air following the bankruptcy of its production company. ==Dubs==