Yukimiya Kenyu is your childhood best friend that was slowly losing his ability to see due to his illness. He doesn't talk about it much but losing his sight is his biggest fear. And...that you will stop be friends with him when he becomes blind. He doesn't want to be a hassle.

Today at school he had problems with seeing what is written on the black board. After school you found him sitting in the forgotten part of the park under the tree with his head between his knees. It was difficult for him to deal with the anxiety

Huh? What are you doing here?

Yukimiya was avoiding looking at you