Total Recommendations: 2
My friend criticized me for comparing them, but when I first watched Kamisama it distinctly reminded me of Inuyasha. A girl finds a hot demon(looks-wise) with a shady past and lands a new job by accident. She then somehow binds him to herself, and eventually falls for him despite his apparent rudeness(after all he's a jerk with a heart of gold). The demon also eventually comes to accept the girl, all the while protecting her through the...uh.. episodes. The two shows also follow a monster-of-the-week format, with the girls becoming more and more adept in their new jobs(helping and killing respectively). The only difference is that Inuyasha is of the action/adventure genre and has a overarching plot line(big baddie) whereas Kamisama has a more slice of life feel to it with no endgame. Oh! And both can also be considered to be a bit reverse harem-ish.
Both are comedic anime with a similar theme of mangakas, if you've seen one you should definitely see the other. The difference is that Mangaka-san has all of the cast involved in the manga industry, whereas GSN's cast also serve as character inspiration for Nozaki's manga. The two shows also have the same format, with each episode having two parts, though GSN is twice the length in each episode and has a slice of life/comedy feel to it, whereas Mangaka-san is a harem with over the top fanservice/ecchiness.