As a lot of people tend to confuse about the last scene of this week's episode, when Setsuna bit her lip and fake a smile. Many of us think that the song was written to display Haruki love for Touma, but IT'S NOT.
Todokanai Koi = unattainable/unreachable love. Which was introduced as an original song of the light music club. The translation from Crunchy/HS was "unrealized love" which caused some sort of misinterpretation among viewers.
Here's the english translation which I can find:
http://atashi.wordpress.com/2012/07/25/white-album-2-introductory-chapter-opening-theme-todokanai-koi/
Or you can check the translation of the OP provided by UTW.
At the moment we can clearly see that, Haruki hasn't fallen for any of the girls, yet (only the two girls started to fall for him). If you read the translation, it gives me the feelings that the song fits perfectly with Setsuna's current situation and describes her feelings for Haruki quite well. The reason for biting her lip is that, the song shows her true feelings, but it was written by Haruki himself and composed by her love rival, so yeah ... I'd be pissed.
Modified by Takana_no_Hana, Nov 11, 2013 6:42 AM