I really hope Haruna (the more popular, other black haired one) doesn't have the hots for MC as well. If both girls like him, then his glasses friend is left out, especially when he likes Haruna, and MC likes Natsumi.
But it seems like from her reaction when MC answered her question as to whether or not he'd support Glasses-kun and Natsumi if they started going out, since she was happy to hear that answer, it seems that Haruna likes the MC too, and is glad that Natsumi might be out of the way, being in a relationship with Glasses-kun instead.