Kazuki Tomori (友利 一希, Tomori Kazuki) is Nao's older brother who once had the ability to change the air vibrations. Previously he was a member of a band which was going to make a contract with a record company, but it was cancelled due to their mother's begging for Kazuki and Nao to enter a certain boarding school. It is revealed that the school has relations with a scientist who later did experiments on Kazuki. He has stayed at the hospital until now and for some time does not even recognize Nao as his sister. However, recently, Yū takes Sala Shane to Kazuki's hospital to meet him, with the hope that he will regain consciousness, and he does.