Doujinshi are a popular medium of self-publishing in Japan, mostly for fan-made manga.
[3] Their activities also included organizing doujinshi conventions where their customers could sell their works.
1994 saw the founding of an industry association, the Japan Doujin-shi Printing Group (日本同人誌印刷業組合, Nihon dōjinshi insatsugyō kumiai).
They agree on a delivery date with the printer, send in their manuscript in analog format via postal mail or in digital format through the printer's FTP server, and make the required payment.
In that case, the doujinshi creator has to submit their manuscript by a strict deadline that cannot usually be extended except by paying more.