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 (玲央奈, Reiōna).

In January 1999, Takase, with a sports background in judo, passed an audition held by Hyper Visual Fighting Arsion and began training professional wrestling at the promotion's dojo.

[2][16] On December 4, Toujyuki Leon defeated Hikaru in the finals of a seven-woman tournament to win the Next Shining Generation (NSG) Championship, an independent title with no official home promotion.

[17] After a fifteen-month reign, Toujyuki Leon and Kaori Yoneyama lost the JWP Tag Team Championship to Ran Yu-Yu and Toshie Uematsu on August 6, 2006.

[21] On March 21, Toujyuki Leon picked up her biggest win in JWP, defeating promotion founder Command Bolshoi in a singles match.

[22] On June 10, Toujyuki Leon reunited with Kaori Yoneyama in an attempt to regain the JWP Tag Team Championship in a gauntlet match.

[25] After picking up another big win over Command Bolshoi on December 9 at the year-end JWP-Climax 2007 event, Toujyuki Leon's year ended with her being given the JWP Technique Award.

[26][27] On June 22, 2008, Toujyuki Leon and Yoneyama defeated Arisa Nakajima and Kana to once again become the number contenders to the JWP Tag Team Championship.

[37] On September 6, Toujyuki Leon and Kaori Yoneyama faced each other in yet another singles match, this time to determine the number one contender to the JWP Openweight Championship.

[38] The following month, Toujyuki Leon got involved in a storyline, where she aligned herself with other JWP wrestlers to defend the promotion against members of the NEO Japan Ladies Pro-Wrestling-based Passion Red stable.

[44][45] On November 27, Leon took part in an independent event produced by Passion Red, where she defeated Natsuki☆Taiyo to win the NEO High Speed Championship, her first title in four years.

During the first two rounds, Leon defeated Ray and Dash Chisako, both times successfully defending the High Speed Championship in the process.

[53][54] On June 12, Leon defeated Shishi no Ana stablemate Hanako Nakamori in the semifinals of the tournament, making her first successful defense of the JWP Openweight Championship in the process.

[59][60] In January 2012, Leon entered the 2012 Tag League the Best, teaming with former Passion Red rival and High Speed Championship challenger Ray as Mascara Voladoras (Spanish for the "Masked [Female] Flyers").

[62] On March 4, the round-robin stage of the Tag League the Best pitted Mascara Voladoras against Leon's Labradorite stablemates Hanako Nakamori and Misaki Ohata.

[65] On May 31, Labradorite held a press conference to announce that Nakamori and Ohata had "graduated" and would be leaving the group following August 12, with anna, Maki Narumiya and Mika Iida joining Leon as their replacements.

[69] On October 28, after Heart Move Kei Reform (HMK) member Emi Sakura had captured the JWP Openweight Championship, Leon, along with Arisa Nakajima, entered the ring to make a challenge for the title.

[72][73] On November 11, Leon entered a four-woman tournament to determine the number one contender to the JWP Openweight Championship, but was defeated in her first round match by HMK member Hanako Nakamori.

[75] The following day, after receiving a bye in the second round, Leon returned to the tournament in the semifinals, defeating JWP Junior and Princess of Pro-Wrestling Champion Manami Katsu.

[76] On November 24, Leon reunited with Ray to enter a tournament for the vacant JWP and Daily Sports Women's Tag Team Championships, defeating Kayoko Haruyama and Manami Katsu in their first round match.

[114] Leon, billed as "León", wrestled her first match for CMLL on the October 12 Super Viernes show in Arena México in Mexico City, losing the Reina-CMLL International Championship to La Amapola in her first defense.

[119][120] The day after that in Puebla, León, Dark Angel and Lady Afrodita were defeated in a six-woman tag team match by La Amapola, Mima Shimoda and Princesa Blanca.

[124][125] Her second successful defense took place at an event held by the newly rebranded Reina Joshi Puroresu, where she defeated CMLL representative Estrellita.

[139] The following day on Volume 47, Leon and Ray unsuccessfully challenged Ayako Hamada and Ayumi Kurihara for the Shimmer Tag Team Championship.