is a Japanese professional wrestling referee and professional wrestler.
She started her career in March 2007, working alongside her sister Io Shirai on the Japanese independent circuit for promotions such as Ice Ribbon, JWP Joshi Puroresu and Pro Wrestling Wave. In June 2010, the Shirais came together with fellow freelancer Kana to form the Triple Tails stable as part of which they began working most notably for Smash. After Io left the stable the following year, Mio and Kana continued working together as the tag team Triple Tails.S. Shirai remained a freelancer until January 2014, when she signed a four-way contract with Ice Ribbon, Oz Academy, Pro Wrestling Wave and Union Pro Wrestling. She retired from professional wrestling due to neck injuries in September 2015 at the age of 27, after which she started working as a referee. She wrestled sporadically in the early 2020s, and in 2024, worked 15 matches in various promotions, while still signed as a referee to Ice Ribbon. In 2025, she became a freelancer, breaking from Ice Ribbon to concentrate more on wrestling.
Professional wrestling career
Team Makehen (2007–2010) Shirai made her professional wrestling debut on March 4, 2007, alongside her younger sister (born Masami Odate), with the two adopting the ring names Mio and Io Shirai, respectively ("Shirai" being Japanese for "Purple Thunder"). In their debut match, the Shirai sisters teamed with Toshie Uematsu to face the trio of Erika Ura, Nozomi Takesako and Yuri Urai. Starting their careers as freelancers, the Shirai sisters represented Team Makehen, a stable made up of wrestlers trained by Tomohiko Hashimoto, in several independent promotions during their first year in the business, including Ibuki, Pro Wrestling Wave, JWP Joshi Puroresu, and Sendai Girls' Pro Wrestling.
On October 19, 2008, Mio and Io made their debuts for one of Japan's largest professional wrestling promotions, All Japan Pro Wrestling (AJPW), wrestling in a match, where they defeated the team of Kyoko Kimura and Mikado. From January to March 2009, the Shirais also made several appearances for another large promotion not usually known for female wrestling, Pro Wrestling Zero1. On April 29, the Shirai sisters won their first championship by defeating Moeka Haruhi and Tomoka Nakagawa in a tournament final to become the first TLW (Totally Lethal Wrestling) World Young Women's Tag Team Champions. Despite its name, the championship was owned and promoted by Pro Wrestling Wave. From July to November, the Shirais spent four months working for the Ice Ribbon promotion.
On November 12, 2009, the Shirais entered Pro Wrestling Wave's Captain's Fall Six Person Tag Team Tournament, teaming with Gami, but the trio was defeated in their first round match by Ran Yu-Yu, Ryo Mizunami and Toshie Uematsu. However, the trio earned their way back into the tournament by defeating Misaki Ohata, Moeka Haruhi and Yumi Ohka in a consolation match later that same day. On November 25, the Shirais and Gami first defeated Bullfight Sora, Cherry and Kaoru in the semifinals and then Ayumi Kurihara, Kana and Shuu Shibutani in the finals to win the tournament. On December 23, the Shirais lost the TLW World Young Women's Tag Team Championship to Misaki Ohata and Moeka Haruhi. On June 9, 2010, Mio entered the 2010 Catch the Wave tournament. After two draws and two losses, Shirai finished last in her block and did not advance in the tournament.
Triple Tails (2010–2011)
On June 19, 2010, the Shirai sisters formed the Triple Tails stable with fellow freelancer Kana, defeating Ayumi Kurihara, Hikaru Shida and Yoshiko Tamura in their first match together at a NEO Japan Ladies Pro Wrestling event. As a result, the Shirais received a shot Kurihara's and Tamura's NEO Tag Team Championship on July 4, but were defeated by the defending champions. Triple Tails returned to its winning ways on August 29, by defeating Asami Kawasaki, Hikaru Shida and Nagisa Nozaki in a six-woman tag team match. On October 18, 2010, Shirai, working under the ring name Kitzune Nanoko, made her debut for AAA in Puebla, Mexico, where she teamed with Alissa Flash to defeat Cynthia and Esther Moreno in a tag team match. In Mexico, both Shirais worked under cat-like masks they would only wear for their entrances in Japan. On October 31, Shirai was renamed Kaguya, while her debuting little sister was given the ring name Oyuki. In their first match under the new names, Kaguya and Oyuki teamed with Yuriko in a six-person tag team match, where they were defeated by Cynthia Moreno, Gato Eveready and Mari Apache. During their stay in AAA, Kaguya and Oyuki became associates of the La Legión Extranjera (Foreign Legion) stable. On November 7, Kaguya and Oyuki defeated Faby and Mari Apache in a tag team match and afterwards stole Faby's AAA World Mixed Tag Team Championship and Mari's AAA Reina de Reinas Championship belts. On November 15, the Apaches and Cynthia Moreno defeated Kaguya, Oyuki and Sexy Star in a six-woman tag team match. A week later, Kaguya, Oyuki and Jennifer Blake defeated Moreno and the Apaches in another six-woman tag team match. This would turn out to be Kaguya's and Oyuki's final AAA appearance, which resulted in the storyline with the Apaches being dropped without a conclusion. Upon the Shirais' return to Japan, Triple Tails made its debut as a unit for Pro Wrestling Wave on December 19, defeating Cherry, Gami and Tomoka Nakagawa in the six-woman tag team main event.
On January 29, 2011, the Shirais made their debuts for Smash, when the Triple Tails stable attacked Yusuke Kodama and Makoto after their matches, with the trio being both times chased out of the ring by Tajiri. On February 13, Triple Tails produced its first own event, where the Shirai sisters wrestled male tag team Momo no Seishun Tag (Atsushi Kotoge and Daisuke Harada) in a losing effort. On February 25, the Shirais made their Smash in-ring debuts at Smash.14, where they teamed with Kana to defeat Ken Ohka, Tajiri and Yoshiaki Yago in an intergender six-person tag team match. In March, Triple Tails took part in Osaka Pro Wrestling's Spring Samba Series, going undefeated in six-person tag team matches for the duration of the tour. On April 30 at Smash.16, Triple Tails was defeated in a six-woman tag team match by Makoto, Serena and Syuri. On May 3 at Smash.17, the Shirai sisters were defeated in a tag team match by Hikaru Shida and Syuri. Triple Tails' second event took place on May 8 and saw Mio, Io and Kana defeat Akino, Kagetsu and Syuri in a main event six-woman tag team match. In June, Mio began wrestling regularly for Union Pro Wrestling, starting a feud with male wrestler Ken Ohka. On July 10, Shirai defeated Ohka to win the SGP Global Junior Heavyweight Championship, afterwards declaring herself Ohka's master.
On July 23, Triple Tails held a press conference to announce that, following the group's third self-produced event on September 18, Io was leaving the stable in order to pursue a singles career. On August 21, Triple Tails made its debut for Oz Academy, defeating the trio of Ayumi Kurihara, Hiren and Yumi Ohka. On September 14, Triple Tails defeated Cherry, Moeka Haruhi and Shuu Shibutani in the group's final Pro Wrestling Wave appearance. Four days later, Triple Tails defeated Dash Chisako, Ryo Mizunami and Sendai Sachiko at their third self-produced event in the group's final appearance together.
Triple Tails.S (2011–2013) After Io's departure from Triple Tails, Mio and Kana renamed the group Triple Tails.S and continued wrestling together as a tag team. However, in Smash, Mio and Kana were broken apart following Io's departure, with Kana being preoccupied with the Smash Diva Championship and Mio entering a storyline with Takuya Kito. The storyline involved Kito repeatedly professing his love for Mio, who refused to return the affection. On September 8 at Smash.21, Shirai defeated Kito in a hardcore match. After the match, when Kito continued to profess his love for Shirai, he was attacked by IWA Japan wrestler Keizo Matsuda. During the following months, Shirai repeatedly cost Kito matches against Matsuda and his colleagues, but still could not get him to leave her alone. After the break up of Triple Tails, Shirai continued making semi-regular appearances for Osaka Pro Wrestling, forming a partnership with male wrestler Hayata, whom she would refer to as her "big brother". The two also went on to team together in Pro Wrestling Wave. On October 19, Shirai lost the SGP Global Junior Heavyweight Championship to Cherry. Initially, Shirai announced that she was leaving Union Pro following her loss, but eventually came back to form a partnership with Ken Ohka, who had now accepted his role as her inferior. Meanwhile, Shirai and Kana also continued to produce their own events; Triple Tails.S' first show took place on November 2 and saw Shirai wrestle Toshie Uematsu to a 30-minute time limit draw in the main event. On November 23, Shirai and Kana defeated Ayako Hamada and Shuu Shibutani in the finals to win the Osaka Joshi Pro Wrestling Tag Team Tournament.
In December 2011, Shirai made her American debut, when she took part in Chikara's JoshiMania weekend. On December 2 in Philadelphia, Pennsylvania, Shirai teamed with Mayumi Ozaki in a losing effort against the team of Ayako Hamada and Cherry. The following day in Everett, Massachusetts, Shirai was defeated by Ozaki in a singles match. On the third and final night of the tour in Manhattan, New York, Shirai, Aja Kong and Tsubasa Kuragaki defeated Hanako Nakamori, Manami Toyota and Sawako Shimono in a six-woman tag team match. On January 3, 2012, Shirai returned to the ring with her sister, when she teamed with Ken Ohka at a Union Pro event to unsuccessfully challenge Io and Nosawa Rongai for the Americas World Mixed Tag Team Championship. At a Pro Wrestling Wave event on February 1, Ayumi Kurihara, Mika Iida and Shuu Shibutani joined forces with Shirai and Kana, turning Triple Tails.S from a tag team once again into a stable. The following month, the stable was renamed White Tails, in reference to Wave's top villainous alliance, Black Dahlia. On February 11, Shirai began working regularly for Oz Academy, defeating Hiroyo Matsumoto, a member of the villainous Seikigun, in her return match to the promotion. On February 26, Shirai was defeated by Seikigun leader Mayumi Ozaki in a tryout match and afterwards agreed to join her stable, noting that they "had a lot of things in common". Back in Smash, the hostilities between Shirai and Takuya Kito ended after Kito led a four-man team to a final victory over a team of IWA Japan wrestlers, which led to Shirai and Kito teaming together and defeating Aki Shizuku and Koji Doi on March 14 at Smash.Final, the promotion's final event before ceasing its operations. Afterwards, Shirai continued working for Smash's follow-up promotion, Wrestling New Classic, teaming with Kana to defeat Makoto and Syuri at the promotion's first event, Before the Dawn, on April 26. After the match, Shirai sided with Makoto and against Kana, when she was verbally assaulting her defeated opponent. Taking Makoto under her wing, Shirai began referring to her as her sister. In early 2012, Shirai started a rivalry in Union Pro with Cherry, attempting to reveal her true age, a secret Cherry had managed to keep for her whole career. On March 18, Cherry defeated Shirai in a match, where she would have had to reveal her age, had she been defeated. A rematch, with an added stipulation that Shirai would have to remove all of her makeup if she lost, was scheduled for May 4, however, Shirai was forced to pull out of the match, after suffering a nasal fracture at an Oz Academy event five days earlier. Shirai ended up managing her replacement, Emi Sakura, to a win, after interfering in the match; as a result, Cherry was forced to reveal that she was born May 14, 1974.