dojin db: http://doujinshi.mugimugi.org/book/4658/Suzumiya-Nono-no-Doujinshi/

E-hentai tip of the gallery:

6) Compilations are not allowed. That means galleries that contain multiple dojins, mangas, cg sets and such will be expunged and replaced by galleries containing only one release. This included galleries mixing languages. On the other hand, this rule does not affect official releases, such as dojins that are official, circle releases of their previously published works), which are allowed.