It is a series of short stories that freely develop SF-like ideas. Returning from their exploration of Venus, the expedition saw a devastated earth... A boy faces a thug at a space airport where the lives of various aliens intersect... It is a pioneering serie in which Osamu Tezuka's SF-like concept was developed vertically and horizontally in such various settings in various eras.

(Source: tezukaosamu.net)