Ai Kamiya

A star player on the volleyball team. She is tall and slim, and very popular at school. She and Izumi work on the library committee together.

[Spoiler] She likes Izumi but when she learns of Izumi and Shikimori's relationship, she feels pained and saddened that she didn't get to have a relationship with Izumi like that. Shikimori helps her reconcile her feelings. [/Spoiler]

(Source: Wikipedia)