Yamamoto is a three-time freestyle wrestling world champion and a Rizin Women's Super Atomweight title contender in MMA.

After that, she achieved four consecutive victories in all Japan, but she was not allowed to participate in the World Wrestling Championships due to the age limit.

[citation needed] In 1999 she temporarily returned to active service, temporarily entered the Queen's Cup Final, won the Asian Championships and won the All Japan Women's Wrestling Championship, but in July 2000 she remarried to Enson Inoue, a fighter and retired from active service.

[citation needed] She later returned to active service on the occasion that women's wrestling becoming the official event for the first time at the 2004 Summer Olympics.

[citation needed] In April 2006, she later married Akira Sasaki, representative of the 2006 Winter Olympics men's alpine skiing[4] (her third marriage).

[7] Although she participated in the All Japan Selection Championship in December, she lost the judgment in the second round and missed her Olympic appearance.

On 1 August 2016, as a result of the closing of the Rio Olympic appearance road, she announced participation in mixed martial arts.

Also the Rizin Fighting World Grand-Prix 2016 held on 25 September the same year was announced as she participated in the opening round of the indiscriminate class tournament, the opponent of the debut match is the "Queen of Shoot Boxing" Rena Kubota, with one loss.

On 31 December, also in the same year, she went to the Rizin Fighting World Grand-Prix 2016 against the KOTC female straw class champion Andy Winn at the Indiscriminate Tournament Final Round, and suffered a second consecutive defeat.

In March 2017, she showed her bold figure entitled "The Strongest Nudity" at the photographic weekly magazine Flash (Kobunsha),[11] and the first nude photo album Queen was released in May.

[19] Yamamoto faced the DEEP Microweight and Jewels Atomweight champion Saori Oshima at Rizin 36 on 2 July 2022.