noun
fan fiction; fanfic
Loanword from English. Refers to stories written by fans based on existing works, characters, or settings.
彼女は人気アニメのファンフィクションを書いている。
She writes fan fiction based on a popular anime.
そのサイトにはたくさんのファンフィクションが投稿されている。
A lot of fan fiction is posted on that site.
Loanword from English 'fan fiction', often abbreviated as 'fanfic'.