This is an adventure story about boy researcher Kenichi and others who depart for Planet Mamango, which is exactly like the ancient Earth.
Having been torn from the earth in ancient times, Planet Mamango is now re-approaching the earth after a lapse of 5 million years.
One night, a private detective named Ban Shunsaku, otherwise known as Higeoyaji, encounters a murder, and meets boy researcher Shikishima Kenichi (Dr. Shikishima), who holds the key to solving the case.
Dr. Shikishima discovers that a stone from the Planet Mamango generates huge amounts of energy, and he names it the "energy stone." Making a rocket out of the energy stone, Dr. Shikishima sets up an exploration team and departs for Planet Mamango. The rocket heads straight for Planet Mamango under the command of Dr. Shikishima, along with Captain Butamo Makeru (who has doctorate in science), Ayame and Momiji, who are cabbages created by the doctor, a rabbit named Mii, and Higeoyaji. On their way to the planet, they discover that news writer Acetylene Lamp has smuggled himself aboard the rocket, and grudgingly allow him to accompany them.
In due time, the rocket lands on the Planet Mamango, where the group finds a "The Lost World," an ancient environment where dinosaurs walk about and ferns and cycads cover the ground.


December 20, 1948
Publishes in two-volumes (Volume 1: The Earth, and Volume 2: The Universe) (Fujishobo)

The two volumes "The Earth" and "The Universe" were simultaneously put on sale on December 20, 1948.
As there was no masterpiece Manga in those days featuring novel-like story development or unhappy endings, Tezuka Osamu's new work opened with the remark, "This is neither a Manga nor a novel."
Tezuka Osamu originally wrote the first trial work under the same theme that he initially created as a junior high school student, and the work was rewritten several times in later years.
Following the first trial work, Tezuka Osamu published a privately printed book at the age of about 20. (The book was lost after the war, however). In 1946, it was run in the Kansai Yoron newspaper (The work was not completed).
Following the publication of the book, a remake was run in the magazine "Bokeno" (published by Akita Shoten Publishing Co., Ltd.) in 1955. However, this work was never completed either.