I don't really like the whole "I'm clearly in love with my best friend but she's in love with someone else and it hurts so much" plot that a lot of yuri uses. Especially if it's not the main character who eventually ends up with her friend (like in Sasameki Koto). I don't feel like it adds anything to the plot here except unnecessary drama and angst, especially because it's often the case that the person that the main character is in love with is kind of a shitty individual, at least compared to the supportive and obviously loving friend character.