One night, Ryosuke Jagata is murdered by a thief after a hidden jewel on his person. His butler and rabbit boy Mimio (Mimi-chan) take quick notice. They soon butt heads with Mustachio, a private detective, who decides to take up the case. Mustachio, wanting more information, comes to the laboratory of Prof. Hoyoku Shikishima, a scientist experimenting with giving animals human souls. Meanwhile, the planet Mamango makes the rounds. Said to be a part of the Earth from long ago, it is now steadily coming closer toward the Earth... Shikishima is researching this planet, and what Jagata was murdered over may be connected to this. (Source: MangaDex)

Lost World: Shikaban was originally drawn by Osamu Tezuka in the early 1940s when he was a middle school student, and differs from the professionally published versions of Lost World. The series was first publicly released in 3 limited edition hardcover volumes by Meichokan Kyoukai on February 28, 1982, and received a general release when it was published in 2 volumes by Kodansha as part of the Tezuka Osamu Manga Zenshuu colelction from December 14, 1994 to January 17, 1995.