Otaku Type Delusion Girl (2007)

Takahiro Abe, a regular high school boy, has a crush on Rumi Asai, who happens to be a hardcore, yaoi-loving, otaku-ish fujoshi. Her biggest fantasy is Abe and Shunsuke Chiba, the handsome class playboy, having homosexual affairs. To make things more complicated, Yōko Matsui, class babe, accidentally reveals herself as an otaku-in-closet, and befriends Asai... more so than your regular girl-girl friendships.