Nana
Mangaka: Yazawa Ai
Genre: shoujo, romance
Synopsis: Two girls with the same first name meet on a train and later on become roommates. Although they have completely opposite personalities -- Nana Komatsu is bubbly, boy-crazy, and naive while Nana Oosaki is a punk rocker chick -- the two become close friends.
Comments: I love love love Nana! Yazawa-san's masterful storytelling is unpredictable, and cliffhangers and surprises abound every chapter. Each character has his/her own quirks and is lovable in his/her own right. Since this is a romantic manga though, it can get really mushy at times but it's not your typical shoujo mush. Nana is in a class of its own.
Scanlators: started by Mangascreener then continued by Lavendar Tinted and Sugar-Oasis
Edit: Nana has been licensed by Viz.