*rolls up sleeves*
Koi wa Tatakoi! (a.k.a.
Love and Fight!) features a female lead who is a writer (though the drama is more about her making observations to use in her articles and less about her actually writing, think Sex and the City)
Egao no Hosoku is about a manga-ka and the woman who's been hired to prod him into finishing his latest work;
and
Love Story is about an editor assigned to a novelist in the middle of a slump.