sidestory
nounUK /ˈsaɪdˌstɔːri/
US /ˈsaɪdˌstɔri/
A sidestory is a smaller story that happens next to the main one.
The book has a fun sidestory about the hero's dog.
OTHER MEANINGS
2. A piece of news that is related to but separate from the main news.
The reporter wrote a sidestory about the people who helped after the storm.
3. An extra story in a game or movie that is not part of the main quest.
I finished the main game and then played a sidestory about a knight.
4. A short account told from a different point of view.
Her diary is a sidestory of the same adventure.