198X. At the brink of nuclear war, scientists around the world collaborate to create a medicine which, when drunk by children, would turn them into geniuses. The scientists succeed in having them create a World's Children's League, and eventually bring about world peace. Ozma is the patrol captain at the Children's League's Japanese HQ. Ten years prior, Ozma's father, Prof. Aoyama, discovered a new medicine, Robon-X, which when drunk with water turns organisms into a solidified state. The information becomes known to the Juda Society, who plot to conquer the world. Aoyama, afraid of his medicine being used for malicious purposes, enters solidified hibernation with his wife through drinking the medicine, and leaves the just-born Ozma behind...

Story about two brothers who go to defeat a monster that is making the villagers suffer. Adapted from a children's story, half manga, half picture book.

Sally wants to visit the human world. She is given permission, but she has to keep her magical abilities secret. She attends school and makes friends with whom she has a lot of fun.

Roppu was a toy abandoned by the child of aliens. He was rediscovered by Roppei, the son of a fisherman. Roppu can fly when the button on his chest on is pressed. Roppu can also create anything, even things thought to be impossible. When the star on his head is pressed, Roppu falls still. Roppu and Roppei have all sorts of adventures, with questionable figures often trying to get their hands on Roppu for their own desires. Volume 2 includes "Bongo" (First Grader version): Bongo is a boy who lives in the jungle and is a master archer entrusted with maintaining peace in the jungle. Bongo learns of a treasure called the Golden Bow, and goes in search of it along with his ally Chap the Squirrel. The two must overcome seven perils to reach it at the Mountain of the Sinking Moon.

A strange man calling himself the God of Gum gives Punch and his sister Pinko a magical bubble gum that allows the chewer to create whatever he wants with the bubbles he blows. However, as the children can't yet blow bubbles well, the God has his assistant Gum Gum stay with them. With the help of the magical bubble gum, the three get into all kinds of mischief.

This volume also contains the short works "Kaseki no Mori no Tenshi" ("The Angel of the Petrified Forest" ) and "Tsuki no Hikari ga Yureru Toki" ("When the Moonlight Shimmers" ).