In high school, Tatsuhiros classmate was the representative of their class. Despite frequently meeting in manga, they did not realize each other's existence until later on. After her father passed away, she had to work hard to support herself and her brother, who is also a hikikomori. Although she initially came across as very uptight during school, Tatsuhiro noticed this about himself and commented on it to her face. Following high school, she maintained much of that personality but became more manipulative in order to survive.