Up until the confession point of the episode, my hatred for Fumino grew ever so steadily. I wasn't able to decipher if she had, indeed, left her hairpin there on purpose, or on accident... or if she had just pulled it out of nowhere and claimed she left it there... but that's beside the point. The blackout scene with naked Fumino is what really sparked the growth in hatred. As others have mentioned, it was completely pointless, and overbearing. I will admit that the scene of both Nozomi and Fumino cuddling next to Takumi was very cute though, and it pained me to see the look of depression in Nozomi's eyes when she realized that Fumino and Takumi were holding hands.

I am still confused about her reasoning behind leaving. What sparked her feeling that she would be a bother... was it because of the feelings between Takumi and Fumino? Or was it something Fumino had said to her beforehand?

Also, like Karco mentioned, Fumino's confession scene was very unexpected, especially because it was in episode 3, and it was so honest. I hated that it got downplayed though by the sudden finding of Nozomi, and then completely deflected after the credits (like Haru mentioned). I hope that scene wasn't just a fluke, and is going to be ignored/forgotten until the end of the series.