ミュンヘンオリンピックレスリング代表だった父・山本郁榮により小学生のころから弟の徳郁（山本KID徳郁)、妹の聖子とともに、レスリングの英才教育を施される。13歳で第1回全日本女子選手権優勝を皮切りに、その後全日本５連覇を達成。1991年、17歳で出場した世界選手権を史上最年少で優勝。その後、1994年と1995年に世界選手権を連覇。またその美貌で数多くのメディアにも取り上げられ、CM出演や写真集発売などアイドルアスリートのパイオニア的存在で絶大なる人気を誇った。1995年に惜しまれつつ現役引退。その後、長男・アーセンの出産を経て1999年に現役復帰を発表し、いきなりクイーンズカップ決勝進出、アジア選手権大会優勝、全日本女子レスリング選手権優勝という衝撃的な復帰イヤーを飾るも、２０００年に再び現役引退。2004年のアテネオリンピックで女子レスリングが初めて正式種目になることを機に再び復帰。アテネオリンピック出場を目指したが、2004年2月の「ジャパンクイーンズカップ」（アテネオリンピック代表選手選考試合）で3位に終わり、オリンピック出場は果たせず同年4月に引退（その後復帰）。2006年12月に次男、2008年11月に長女をそれぞれ出産しカナダ・トロントに生活拠点を移し活動。2015年12月にカナダ国籍取得。カナダ代表としてリオ五輪出場を目指すも出場は叶わなかった。２０１６年、総合格闘家への転向を発表。同年９月RIZIN埼玉スーパーアリーナ大会にてデビュー。当初は苦戦したものの2018年は3連勝を飾り本領発揮。2020年は念願のタイトル獲得を狙う。通算戦績6勝4敗（2020年3月現在）

Miyuu Yamamoto was educated from her elementary school age by her father Ikuei Yamamoto, Munich Olympics wrestling representative, with her younger brother Norifumi (Norifumi “KID” Yamamoto) and younger sister Seiko. After winning the 1st Japan Women’s Championship at the age of thirteen, she achieved consecutive victories in all Japan. In 1991, she won the world’s first championship which she participated for the first time at the age of seventeen as the youngest ever in history. Then she also won the world championships in 1994 and 1995. She was also featured in numerous medias for her beauty, and became a pioneering idol athlete, appearing in commercials and releasing photo collections. In 1995, she retired which was greatly missed by a number of people. After giving birth to her first son Arsen, she announced her returning to active service. She entered the Queen’s Cup Final, won the Asian Championships and won the All Japan Women’s Wrestling Championship, but in July 2000 she retired again. She later returned on the occasion that women’s wrestling becoming the official event for the first time at the 2004 Athens Olympics. Although it aimed for her Athens Olympic appearance, she finished third in the “Japan Queen’s Cup” (Athens Olympic national team selection game) in February 2004, and she could not play her Olympic appearances. Then she retired from active services in April of the same year (later returned). After giving birth to her second son in December 2012, and her first daughter in November 2008, she moved to Toronto, Canada. In December 2015, she acquired Canadian citizenship. She aimed to participate in the Rio Olympics as a Canada representative but she couldn’t. In 2016, she announced her participation in mixed martial arts. In September of the same year, she made a debut at the Rizin Fighting World Grand-Prix in Saitama Super Arena. She had a hard time at first but she achieved three consecutive victories in 2018. In 2020, she is longing for winning the title. Her present record is 6 wins out of 10 matches (March 2020).