The "ben" mentioned on the Internet is another name for fan comics.

To be more specific, it refers to unofficial comics that are created secondary. In a broad sense, "ben" can refer to single-volume books, fan books, and sometimes laptops in the real world. In addition, some game players call plug-ins, auxiliary tools, etc. "ben".

In a broad sense, single-volume books refer to comics or light novels that are serialized to a certain number of episodes or accumulate a certain popularity, and then the serialized content is bound into independent books for sale; fan books refer to literary or artistic works that are created secondary by enthusiasts using characters from specific literary, anime, movies, and game works (but not limited to secondary creations, there are also many fan books with original characters as content.), and the plot is basically unrelated to the original work (such as virtual scenes, campus life, other works, etc.), that is, fan fiction and fan paintings are made into collections.