Gaiden
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Gaiden is a Japanese term for a side story. Sometimes the English phrase "Another Story" is used within a Japanese title. Often the side story is considered to take place in an alternate universe from its original counterpart, and does not affect the main story.
"Gaiden" is used frequently in video game, manga, and anime series (eg- Albert Odyssey Gaiden, Saiyuki Gaiden (Manga), Ninja Gaiden (Game)).