Mangirl is about a group of girls who start up their own manga magazine called Earth Star Entertainment.
While I was looking up some info about the show, I noticed that the original manga was serialized in "Earth Star Entertainment's Comic Earth Star magazine" (Source: Wikipedia). This seems to be a real company with a real website that even shares its logo with the fictional company's logo in the show.
Is any of Mangirl based on anything from the real life Earth Star Entertainment? For example, were the creators of the real life company all females or all amateurs, similar to the characters in the show?