長岡 琴鳥

Hometown: Shizuoka Prefecture
Likes: Exercising
Dislikes: Cooking (it's catastrophic)
Favorite things: Junk food

One of the girls living in the dorms. Kotori is friendly but often misunderstood due to how she is clumsy and can't be honest. She distances herself from her classmates and dormmates as she has her reasons.

It is revealed that she chooses to be alone because of her parents relationship as she hated how her parents always argue with one another. She will slowly accept friendship again after dating and she will start changing.