sequel -
A narrative that is written after another narrative set in the same universe, especially a narrative that is chronologically set after its predecessors, or perhaps improper usage any narrative that has a preceding narrative of its own.
Wikipedia
A sequel is a work in literature, film, or other media that chronologically portrays events following those of a previous work. In many cases, the sequel continues elements of the original story, often with the same characters and settings. A sequel can lead to a series, in which key elements appear in a number of stories.
OmegaWiki Dictionary
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sequel Any work of literature, film, theater, or music that continues and extends the story of some earlier work.
