Satone Shichimiya  

Sophia Ring SP Saturn VII, 七宮 智音

Shichimiya Satone was Yuutas middle school classmate. Although she considered Yuuta to be her only true friend, she ended up transferring schools without saying goodbye during their second middle school year. She suffers from delusions, calls herself "Sophia Ring SP Saturn VII," and addresses Yuuta with the nickname "Yuusha."