Chikayo Nagashima Chikayo Nagashima is a Japanese Professional wrestler . Early life . Nagashima grew up a fan of professional wrestling and began practising judo in Middle schooland [ amateur wrestling in high school , finishing third at the 47 kg ( 104 lb ) class of the All Japan Women ' s Open Championship games . Professional wrestling career . Gaea Japan ( 1995 – 2005 ) . Instead of continuing her amateur wrestling career in a university , Nagashima took part in an audition held by professional wrestling promotion , Gaea Japan , which she passed with flying colors . Nagashima eventually made her in - ring debut at Gaea Japan ' s inaugural event on April 15 , 1995 , wrestling Toshie Uematsu to a twenty - one - minute draw . On April 29 , 1996 , Nagashima defeated Sonoko Kato in the finals of a tournament contested between Gaea Japan ' s rookies . On July 31 , Nagashima turned on the Gaea Japan Seikigun ( " regular army " ) and joined forces with Mayumi Ozaki , Carlos Amano and Sugar Sato , forming a stable , which later became known as Oz Academy . As a result , Nagashima began working as a villainous character for the first time in her career . Nagashima also made guest appearances for the All Japan Women ' s Pro - Wrestling promotion , where she and Sato won the AJW Tag Team Championship , Nagashima ' s first title in professional wrestling , on September 1 , 1996 . > From 1998 to 2001 , Nagashima and Sato also won Gaea Japan ' s tag team championship , the AAAW Tag Team Championship , three times . In May 2000 , Nagashima and Sato ended their longtime partnership with Mayumi Ozaki by quitting her Himiko stable , the most recent incarnation of Oz Academy , and returning to Gaea Japan Seikigun . On June 2 , 2002 , Nagashima first won a tournament during an afternoon show to become the number one contender to Gaea Japan ' s top title , the AAAW Single Championship , and later that same day , during an evening show , defeated Meiko Satomura to become the new champion , while also becoming the lightest champion in the title ' s history . She lost the title to Manami Toyota on October 20 . During the next two years , Nagashima went on to win the AAAW Tag Team Championship two more times , once with Meiko Satomura and once with old partner Sugar Sato . Nagashima ' s five tag team title reigns are a Gaea Japan record . On April 10 , 2005 , Gaea Japan held its final event before going out of business , during which Nagashima and Sato defeated Ran Yu - Yu and Toshie Uematsu , the final AAAW Tag Team Champions , in a non - title match . Oz Academy ( 2005 – 2015 ) . Following the folding of Gaea Japan , Nagashima affiliated herself with Mayumi Ozaki ' s Oz Academy promotion , which she now had turned into a full promotion . During 2005 , Nagashima also made several appearances for the Hustle promotion , working under a mask as " Blanca X " . In early 2006 , Nagashima , along with several other Oz Academy workers , made her first trip to Mexico , taking part in events held by Asistencia Asesoría y Administración ( AAA ) . Back in Oz Academy , as representatives of the Oz Seikigun , Nagashima and fellow Gaea Japan alum Sonoko Kato became three - time Oz Academy Tag Team Champions . In early 2008 , Nagashima returned to Mexico ' s AAA , taking part in the Reina de Reinas Universal Tournament , from which she was eliminated by Mari Apache . On September 23 , 2011 , Nagashima turned on the Oz Seikigun ( 正規軍 ) and joined the villainous Seikigun ( 正危軍 ) , another incarnation of the original Oz Academy stable , after the stable ' s leader Mayumi Ozaki had announced that she was only going to be defending the Oz Academy Openweight Championship against her stablemates . On February 26 , 2012 , Nagashima defeated Seikigun stablemates Hiroyo Matsumoto , Ran Yu - Yu and Yumi Ohka to become the number one contender to the Oz Academy Openweight Championship . On March 25 , Nagashima defeated Ozaki in a Dress Up Wild Fight 30 minute Time of the Trial match to become the new Oz Academy Openweight Championship . Initially a reluctant member of Seikigun , Nagashima embraced her " dark side " only after cheating to successfully defend the Oz Academy Openweight Championship against Hiroyo Matsumoto on August 19 . Nagashima made her second successful title defense on January 13 , 2013 , against Seikigun ' s newest member , Mio Shirai . On April 24 , Nagashima lost the Oz Academy Openweight Championship to Akino in her third defense , ending her reign at 395 days , the longest in the title ' s history > Afterwards , Nagashima came to odds with her Seikigun stablemates , which led to a Hair vs . Hair match on September 15 , where Maymi Ozaki , waging both her own and the stable ' s manager Mika Nishio ' s hairs , defeated Nagashima , forcing her to have her head shaved . Nagashima finally turned on Ozaki and the Seikigun on January 12 , 2014 . On February 9 , Nagashima suffered a cruciate ligament rupture in her left knee , forcing her to undergo surgery on February 18 . 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 . Freelancing ( 2015 – present ) . Nagashima ' s first major match since becoming a freelancer took place on September 23 , 2015 , when she unsuccessfully challenged Ayako Hamada for Pro Wrestling Wave ' s Single Championship . On September 19 , 2016 , Nagashima and Megumi Yabushita , representing the Crysis stable , defeated Keiko Aono and Kyoko Inoue to win World Woman Pro - Wrestling Diana ' s vacant World Tag Team Championship .