Kindergartener

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.

Leo the Lion Cub (Manga)

As a tie-in to the Jungle Emperor (1965-66) television show, Leo the Lion Cub (1965-67), was 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.