Asahi was Toru's friend in childhood, one of a few who knew about him being an Iris Zero. When they got into a fight she revealed his secret, causing him to become a victim of bullying - that made them more of "childhood enemies" than "childhood friends". Asahi is now Sasamori Koyuki's best friend, together with her in class 2-6. When Asahi slaps her homeroom teacher, Fujimura-sensei, Koyuki runs to Toru (who's "qualified" to help) and makes him resolve the problem - thus causing Toru and Asahi to eventually make up. With her Iris's power, Asahi can see a devil's tail growing out of people when they are lying. She has a strong sense of justice and was aspiring to become a police officer in the future. After the incident, she decided to aim to be a lawyer instead. She is strong-willed and independent though she is afraid of ghosts and the like.