OZアカデミー
After a full year of being sidelined, Nagashima returned to the ring on March 1, 2015, in a match, where she was defeated by Hikaru Shida. On July 19, Nagashima announced she was leaving Oz Academy and becoming a freelancer following August 23. In her final match under an Oz Academy contract, Nagashima defeated Ayako Hamada.