Although The Twin Knights (1958-59) is a follow up to the original Princess Knight [Shojo Club] (1953-56), in a strange way, it owes much of it’s existence to a little-known work of Osamu Teukza’s known as The Kokeshi Detective Bureau (1957)
With the success of the 1965 anime television series, Osamu Tezuka also decided to revisit Jungle Emperor (1950-54) in manga format – only this time for a much younger audience. Not truly a sequel, the 20 short stories, collectively known as Leo the Lion Cub (1965-67), were simultaneously published on a monthly schedule by Shogakukan in both Kindergartener and First Grader from April 1965 to March 1967 and (presumably as the readership got older) in both Third Grader and Fourth Grader from May to November 1966.
Originally planned as a one–shot manga entitled Mitsurin Taitei [密林大帝] – literally “Dense Forest (i.e. “Jungle”) Emperor”, publisher Kenichi Kato convinced the young Osamu Tezuka to expand on his original story idea and offer it as a regular four–page feature in the monthly Manga Shonen.
Following hot on the heels of Swallowing the Earth (1968-69), Tezuka’s next project, I.L (pronounced “Aye-El”), was originally intended to a more straight-forward "comic for men" (as the name of the publication branded itself), however eventually became more of a "fairy tale for adults" instead.
Just as Tezuka felt the realism was becoming too much for a shonen periodical, the opportunity to start the ambitious sci-fi series Norman (1968) came up with a different publisher, and Tezuka’s enthusiasm dropped substantially. Ultimately, at the request of the editor, he suspended publication of Dororo (1967-69), leaving the series with no ending.
Ongoing Serial: a series of episodes, published over a span of weeks/months/years where the story plot is connected from chapter to chapter and must be read in chronological order for it to be understood properly.
Chapter Serial: a series of episodes, published over a span of weeks/months/years where the story plot is self-contained to a single chapter. There may be an overarching plot, but the stories can generally be read in any order and be understood
Book: an all-in-one self contained story published as a one-off.
Supplement: an an all-in-one self contained story published as a stand-alone supplement to a regular weekly/monthly periodical.
Short Story: an all-in-one, self contained story that was published in a regular weekly/monthly periodical
Anthology: a collection of all-in-one, self contained stories that were published in a regular weekly/monthly periodical but are generally grouped together.
