doujin circle; fan club; hobbyist group
A group of like-minded people who create and publish self-produced works, typically manga, novels, games, or music, often for sale at events like Comiket. The term is strongly associated with Japanese otaku culture.
She draws manga in a doujin circle.
The number of doujin circles participating in Comiket is increasing.
Compound of 同人 (doujin, 'like-minded people') and サークル (sākuru, from English 'circle'), referring to a group of people with shared interests in creating self-published works.