神代 琴音

Mamoru's older sister who survived from the fire from the village, adopted along with Mamoru by Kamishiro family, she become ''the pearl'' of the family, a very friendly girl who's treating everyone equally and likes to stay in garden most of time admiring flowers.
 
She's ready to do anything for her family but most important, for her beloved little brother who wants to protect him no matter what and keeping him away from danger.
At the end of her route, it's revealed that Mamoru and Kotone aren't actually blood related, Kotone knowing that all the time.