Manga 20704 Dear

The heroine doesn't have much of a girl-esh character, however later on noticed how gender plays quiet a big role xD.
She just accepts the other party's emotions the way they are, and doesn't really make a big fuss about it as her 2 childhood friends are still important to her. Though she is quiet aware of her emotions and does make it clear :).
I didn't really like the idea of another girl getting in the circle of friends at first, but later on, it was clear that it didn't really make much of a difference.