A het guy is exposed to the world of gay love, when he realizes that the girl he likes, is an intense fujo. He tries his best to see things the way she sees, and while sometimes he succeeds, sometimes he fails terribly.
The clue here is kind of in the titles, but since I'm always willing to lend a hand to those in need:
Both stories are about fujoshis; crazy females who create ladyboyxladyboy fantasies in their depraved minds and scare me.
Rumi is a little over the top compared to Kanojo, and its titular female lead is what I imagine to be a severe/worrying case. This is because, where as Rumi is fictional, the Kanojo manga was based on the real-life experiences of a blogger who detailed what he has endured to be with the woman he loves. But both series have plenty of 'laugh out loud' moments, in any event, so it matters not in the grand scheme of things.
Read both and you'll either A) laugh a lot; internally or otherwise or B) reveal to yourself that you're too dull to ever get laid. One of the two. read more
In Moekoi it's the boy who is the otaku, while in Fujoshi Kanojo, we have a regular guy paired up with a boys love fanatic girl. Humorous situations ensue. Fujoshi Kanojo is more mature content wise and the characters are older.
If you enjoy the antics of the otaku girls in Kuragehime you might enjoy Fujoshi Kanojo, which is also a funny josei story involving otakus. The plots are very different, although both have otakus, humor and romance. In Fujoshi Kanojo, we have a normal non otaku boyfriend dating a BL / yaoi obsessed girl and having to deal with a lot of uncomfortable situations. While in Kuragehime we have a bunch of otakus of all different types and are treated to watching their antics. If you are an avid manga reader ( maybe an otaku yourself ) who can still enjoy laughing about your "hobbies" you might get good laughs from both of these mangas.  read more
Tonari no 801-chan helped inspire Fujoshi Kanojo and offers a slightly less crazed fujoshi lead (don't let the green monster fool you!). Tonari no 801-chan is more comedy based and less romantic. However, Fujoshi Kanojo's "romance" is hampered by the girl's over-the-top behavior.
both about fujoshi~women who live and love all things BL~YAOI *drools*
maiden road is about a girl who expands on the lives of her male class mates and fujoshi kanojo is about a woman who is a yaoi fanatic... but gets a boyfriend who eventually excepts how she thinks about him and other men ~haa >_< both very good reads.