is a Japanese Nordic combined skier and ski jumper. She medaled bronze at the 2023 Nordic World Ski Championships.
Early life
Kasai was born on 4 February 2004 in Sapporo, Hokkaido, and has an older twin sister, Yuna Kasai.
She graduated from Nishino Junior High School and Tokai University Sapporo High School; she is currently part of the Waseda University Ski Club.
Career
Kasai represented Japan at the 2020 Winter Youth Olympics, where she ranked 9th in the girls' individual Nordic combined event.
In December 2021, Kasai won the women's championship at the Nordic Ski Yoshida Cup Jump Tournament. She medaled silver in both the individual Nordic combined event and the team ski jumping event at the 2022 Nordic Junior World Ski Championships. At the 2021–22 FIS Nordic Combined World Cup Kasai ranked second in her two competitions.
Kasai medaled bronze at the FIS Nordic World Ski Championships 2023, the first Japanese medal in her event. She also participated in the mixed team ski jumping event as part of the Japanese team, which ranked fifth. At the 2023 Winter World University Games in Lake Placid, Kasai medaled gold in the women's individual Nordic combined event and silver in the mass start event behind her sister. In the 2022–23 FIS Nordic Combined World Cup, Kasai ranked seventh overall.