Alot of artist have "Sketchy" diary mangas (much like Shiba admiral) that they post that alot find funny, but certainly probably wouldn't meet Danbooru's quality check due to how sketchy they are. Basically, you really need to be a kancolle player to understand most of the jokes these diary mangas are about since most are gameplay mechanics or centered on kancolle's official twitter news.
Things like reaction faces to girls getting a Kai-ni or the announcment of a new event.