She won the gold medal in the women's 62 kg event at the 2020 Summer Olympics held in Tokyo, Japan.

[1] In 2018, she won the silver medal in the women's 62 kg event at the World Wrestling Championships held in Budapest, Hungary.

[4][5][6] In 2017, she competed in the women's 63 kg event at the World Wrestling Championships in Paris, France without winning a medal.

She won the gold medal in the women's 62 kg event at the 2020 Asian Wrestling Championships held in New Delhi, India.

[8][9] In 2021, Kawai won the gold medal in the 62 kg wrestling division at the Tokyo Olympics.