Haruka Nogizaka's Secret: Purezza(2009)

Nogizaka Haruka no Himitsu: Purezza

Haruka's manga and anime hobby is still concealed by her dear friend Yuuto, but Yuuto's other female friend starts to feel affection and attraction towards him, so a feelings war begins among their circle of friends. Meanwhile Yuuto tries to make Haruka happy doing what she likes the most: drawing manga, watching anime, and attending special anime events.

(Source: Anime News Network)