The outer story refers to the story, animation, novel, etc. adapted from the supporting characters in addition to the main characters. It is also the most commonly used term in animation. Sometimes it is also adapted by the main characters, but the plot is relatively easy, and has little to do with the original work. It is usually used to relax and laugh, and you can see the other side of the main characters.
"Outer story" refers to the story that has not been written in the main story, but the author wants everyone to know. It has little connection with the main story and can form a story independently. But if you read the story of "Fanwai Chapter", you will have a deeper understanding and perception of the main story.
Fanwai is a branch of the story outside the main story. The characters in the story are treated separately to create a new story or a story similar to the main story but told or staged by other people. The other is to tell some details mentioned in the main story but not detailed, and fully expand them here to give readers an explanation.
