Sayane Kiriyama

Sayane Kiriyama is Shuu's childhood friend. They used to always hang with each other and she had feelings for Shuu but for some reason they started drifting apart afterwards. They used to play together, him playing the piano and her singing but Shuu realizing he couldn't keep up with Sayane's "genius" singing pulled himself away from her, afraid he would be thrown away. She became turned to be a famous singer but her career was put on hiatus due to some mental health issues according to the news.