Yoneyama made her professional wrestling debut for the JWP Joshi Puroresu promotion on November 29, 1999, in a match against Kayoko Haruyama, during which she suffered an eye injury, which forced her to take an early break from her new career.
After making her return in early 2000, Yoneyama continued wrestling for JWP, but also made appearances in promotions such as All Japan Women's Pro-Wrestling (AJW), Big Japan Pro Wrestling (BJW), Hyper Visual Fighting Arsion, JDStar, International Wrestling Association of Japan, Ladies Legend Pro Wrestling (LLPW) and NEO Japan Ladies Pro Wrestling.
Yoneyama won her first professional wrestling championship on July 6, 2002, when she defeated Erika Watanabe for the JWP Junior Championship.
On July 20, Yoneyama and Kayoko Haruyama defeated Mika Nishio and Miyuki Fujii for the AJW Tag Team Championship, which was followed by Yoneyama defeating Fujii in a singles match on November 29 to win the AJW Championship.
On January 2, 2003, Yoneyama won yet another title by defeating Princesa Sandy for the BJW Women's Championship.
Her AJW Championship reign ended two days later, when she was defeated by Mika Nishio, and a month later she and Haruyama were stripped of the AJW Tag Team Championship.

On January 25, 2004, Yoneyama and Haruyama defeated Etsuko Mita and Misae Genki in a tournament final to win the JWP Tag Team Championship.
On August 15, Yoneyama ended her two-year reign with the JWP Junior Championship by vacating the title.
On December 12, Yoneyama and Haruyama lost the JWP Tag Team Championship to Akino and Tsubasa Kuragaki.
Yoneyama would regain the title from Akino and Kuragaki on May 15, 2005, this time teaming with Toujyuki Leon.
On August 7, Yoneyama defeated Tanny Mouse to become the 199th Dramatic Dream Team (DDT) Ironman Heavymetalweight Champion, but immediately afterwards vacated the title and entered a battle royal to determine the 200th champion.
In the match, Mouse would regain the title.
After a fifteen-month reign, Yoneyama and Leon lost the JWP Tag Team Championship to Ran Yu-Yu and Toshie Uematsu on August 6, 2006.
While still maintaining JWP as her home promotion, in September 2006, Yoneyama began working regularly for her friend Emi Sakura's new Ice Ribbon promotion.
Yoneyama ended the year by winning the Daily Sports Christmas Cup.
On February 28, 2007, Yoneyama and Toshie Uematsu won a one night tournament to become the number one contenders to the JWP Tag Team Championship.
However, they would fail to capture the championship in their title match against Kazuki and Sachie Abe on March 21.
In late 2007, Yoneyama began feuding with JWP Openweight Champion Azumi Hyuga, which led to a title match between the two on December 9, where Hyuga retained her title.
In January 2009, Yoneyama debuted a new character, Yoneyamakao Lee, a Chinese wrestler supposedly signed to the nonexistent New Beijing Pro Wrestling (NBPW) promotion.
The character mainly made appearances for DDT, the inventors of the NBPW concept.
On July 19, Yoneyama and Emi Sakura defeated Command Bolshoi and Megumi Yabushita for the JWP Tag Team and Daily Sports Women's Tag Team Championships.
On August 2, Yoneyama defeated Pro Wrestling Wave representative Yumi Ohka in the finals to win the 2009 Natsu Onna Kettei Tournament.
On September 20, Yoneyama made an appearance for NEO Japan Ladies Pro Wrestling, defeating Natsuki☆Taiyo for the NEO High Speed Championship.
The following day, Yoneyama and Sakura won another championship by defeating Minori Makiba and Nanae Takahashi for Ice Ribbon's International Ribbon Tag Team Championship, meaning that, for the second time in her career, Yoneyama was now holding four different championships simultaneously.
Yoneyama's and Sakura's three reigns ended on December 13, when they lost all of their tag team titles to Azumi Hyuga and Ran Yu-Yu.

On July 4, 2010, Yoneyama defeated Kayoko Haruyama in a tournament final to become the number one contender to the JWP Openweight Championship.
On July 18, Yoneyama defeated Nanae Takahashi to win the JWP Openweight Championship
Yoneyama made her professional wrestling debut for the JWP Joshi Puroresu promotion on November 29, 1999, in a match against Kayoko Haruyama, during which she suffered an eye injury, which forced her to take an early break from her new career. After making her return in early 2000, Yoneyama continued wrestling for JWP, but also made appearances in promotions such as All Japan Women's Pro-Wrestling (AJW), Big Japan Pro Wrestling (BJW), Hyper Visual Fighting Arsion, JDStar, International Wrestling Association of Japan, Ladies Legend Pro Wrestling (LLPW) and NEO Japan Ladies Pro Wrestling. Yoneyama won her first professional wrestling championship on July 6, 2002, when she defeated Erika Watanabe for the JWP Junior Championship. On July 20, Yoneyama and Kayoko Haruyama defeated Mika Nishio and Miyuki Fujii for the AJW Tag Team Championship, which was followed by Yoneyama defeating Fujii in a singles match on November 29 to win the AJW Championship. On January 2, 2003, Yoneyama won yet another title by defeating Princesa Sandy for the BJW Women's Championship. Her AJW Championship reign ended two days later, when she was defeated by Mika Nishio, and a month later she and Haruyama were stripped of the AJW Tag Team Championship.
On January 25, 2004, Yoneyama and Haruyama defeated Etsuko Mita and Misae Genki in a tournament final to win the JWP Tag Team Championship. On August 15, Yoneyama ended her two-year reign with the JWP Junior Championship by vacating the title. On December 12, Yoneyama and Haruyama lost the JWP Tag Team Championship to Akino and Tsubasa Kuragaki. Yoneyama would regain the title from Akino and Kuragaki on May 15, 2005, this time teaming with Toujyuki Leon. On August 7, Yoneyama defeated Tanny Mouse to become the 199th Dramatic Dream Team (DDT) Ironman Heavymetalweight Champion, but immediately afterwards vacated the title and entered a battle royal to determine the 200th champion. In the match, Mouse would regain the title. After a fifteen-month reign, Yoneyama and Leon lost the JWP Tag Team Championship to Ran Yu-Yu and Toshie Uematsu on August 6, 2006. While still maintaining JWP as her home promotion, in September 2006, Yoneyama began working regularly for her friend Emi Sakura's new Ice Ribbon promotion. Yoneyama ended the year by winning the Daily Sports Christmas Cup. On February 28, 2007, Yoneyama and Toshie Uematsu won a one night tournament to become the number one contenders to the JWP Tag Team Championship. However, they would fail to capture the championship in their title match against Kazuki and Sachie Abe on March 21. In late 2007, Yoneyama began feuding with JWP Openweight Champion Azumi Hyuga, which led to a title match between the two on December 9, where Hyuga retained her title. In January 2009, Yoneyama debuted a new character, Yoneyamakao Lee, a Chinese wrestler supposedly signed to the nonexistent New Beijing Pro Wrestling (NBPW) promotion. The character mainly made appearances for DDT, the inventors of the NBPW concept. On July 19, Yoneyama and Emi Sakura defeated Command Bolshoi and Megumi Yabushita for the JWP Tag Team and Daily Sports Women's Tag Team Championships. On August 2, Yoneyama defeated Pro Wrestling Wave representative Yumi Ohka in the finals to win the 2009 Natsu Onna Kettei Tournament. On September 20, Yoneyama made an appearance for NEO Japan Ladies Pro Wrestling, defeating Natsuki☆Taiyo for the NEO High Speed Championship. The following day, Yoneyama and Sakura won another championship by defeating Minori Makiba and Nanae Takahashi for Ice Ribbon's International Ribbon Tag Team Championship, meaning that, for the second time in her career, Yoneyama was now holding four different championships simultaneously. Yoneyama's and Sakura's three reigns ended on December 13, when they lost all of their tag team titles to Azumi Hyuga and Ran Yu-Yu.
On July 4, 2010, Yoneyama defeated Kayoko Haruyama in a tournament final to become the number one contender to the JWP Openweight Championship. On July 18, Yoneyama defeated Nanae Takahashi to win the JWP Openweight Championship
Kaori Yoneyama