She has won five FILA Wrestling World Championships and two Olympic Bronze medals in the 72 kg weight class.

She is sponsored by Japan Beverage Inc. and was nominated by the Japanese Olympic Committee's Special Athlete Campaign.

Her father is professional wrestler Animal Hamaguchi, who is known for his emotional displays during Kyoko's matches.

At the age of fourteen, she decided that she wanted to be a female professional wrestler and trained in the Animal Hamaguchi's Wrestling Dojo.

She was also a flag bearer for the Japanese team in the opening Olympic ceremonies in 2004.