[2] 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.

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.

In 1985, Harmony Gold also produced two feature-length movie adaptations, edited from the TV series.

The Brave Frog was later dubbed to Spanish and released by East West DVD Entertainment in the United States in 2005, using the title La rana valiente.

This version's lines and voice actors are distinct from La ranita Demetan, which suggests that these two Spanish dubs were actually produced by two different studios.