Rena Takase is a Japanese professional wrestler, better known by the ring name Leon. Trained by Hyper Visual Fighting Arsion, Takase made her debut for the promotion in March 2000, working under her real name. After a change in management, Arsion was renamed Major Girl's Fighting AtoZ in 2003, and Takase received a new ring name, Leo-na . After quitting AtoZ in 2005, Takase became a freelancer, now working under a mask and the new ring name Toujyuki Leon . After two years of working for several independent promotions, including JDStar, M's Style and Oz Academy, Takase made JWP Joshi Puroresu her new home promotion in January 2007. In January 2010, Takase's ring name was shortened to just Leon and the following year, she won JWP's top title, the JWP Openweight Championship, while also becoming the leader of the Shishi no Ana stable. Takase remained with JWP until the promotion's folding in April 2017.

Oz Academy is a Japanese joshi puroresu or women's professional wrestling promotion founded by Mayumi Ozaki. The promotion's full official name is Oz Academy Women's Professional Wrestling . In addition to the contracted members of the roster, Oz Academy has also employed some of the top freelancers in all of joshi puroresu, including Ayumi Kurihara, Hiroyo Matsumoto, Manami Toyota and Tomoka Nakagawa. The promotion has a television deal with Gaora.