Fangirl, Vol. 1: Manga — Rainbow Rowell

Cath doesn't need friends IRL. She has her twin sister, Wren, and she's a popular fanfic writer in the Simon Snow community with thousands of fans online. But now that she's in college, Cath is completely outside of her comfort zone. There are suddenly all these new people in her life. She's got a surly roommate with a charming boyfriend, a writing professor who thinks fanfiction is the end of the civilized world, a handsome new writing partner…
And she's barely heard from Wren all semester!