In May 1998, a new student joined Yomiyama North Middle School's third year class in the third grade. He was 15 years old and had no siblings. According to his family history, his mother passed away shortly after giving birth to him. Despite this, he became fascinated with Mei Misaki and tried to establish a friendship with her. However, little did he know that doing so would cause problems.
He has pneumothorax (collapsed lung), which is the reason why he is absent from the school for a month at the start of the story. This is also the rea