Jisho

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がいでん 外伝
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Noun
1. supplementary biography​See also 本伝
Noun
2. anecdote; side story; spin-off​
Wikipedia definition
3. Gaiden​is a Japanese-language word meaning "side story" or "tale", used to refer to an anecdote or supplementary biography of a person. The use of gaiden is commonly used in popular Japanese fiction to refer to a spin-off (canonical or otherwise) of a previously published work that is neither officially considered a sequel nor a prequel. However, some gaiden are retold stories in the perspective of a different character, similar to that of a flashback.
Read “Gaiden” on English Wikipedia
Read “外伝” on Japanese Wikipedia
Read “Gaiden” on DBpedia

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