This was the first episode of Mushi Pro Land, a unique series of 60-minute animated programs. It was also Japan's first 60-minute animated TV program. However, the series never materialized and only this episode was actually aired. The story follows Stevenson's "Treasure Island," featuring characters in the form of animals. For example, the pirate Silver is illustrated as a wolf, where the main character Jim is changed into a rabbit. This has, therefore, nothing to do with the "New Treasure Island," Tezuka's masterpiece Manga.

Junai Monogatari AKA Story of Pure Love is about two poor youths, Mitsuko and Kando, rebelling against society in various ways, who are desperately trying to be together despite tortuous circumstances. The film depicts their lives as thieves, menial laborers who can get little pay, society outcasts, and of course, lovers. Junai Monogatari depicts, mostly, their struggles within the Japanese reformatory system and Mitsuko's worsening sickness.

In the wake of the 1956 Prostitution Prevention Law, a young woman recently released from one of Japan's new rehabilitation centers struggles to build a new life.