Onitsuka has been taking part in TTR World Snowboard Tour competitions since 2011 . In February 2012 she won her first victories in international competitions in the Rail Jam at The Burton Pro-Test in Keystone and in Slopestyle at the Burton European Junior Open in Laax . In January 2013 she won the Big Air competition at the O'Neill Evolution in Davos . At the beginning of the 2013/14 season she won the slopestyle at the South America Rookie Fest 2013 in Valle Nevado . She drove her first FIS World Cup race in December 2013 in Copper Mountain , which she finished in 46th place in Slopestyle. At the Burton European Open 2014 in Laax, she took second place in slopestyle. In March 2014, she became the Japanese champion in slopestyle in Niseko . At the 2015 Snowboard World Championships on Kreischberg , she won gold in slopestyle.
At the beginning of the 2015/16 season, she won Big Air at the Winter Games New Zealand in Cardrona . In the further course of the season she was third in the Laax Open in slopestyle and took eighth place in the Slopestyle at the 2016 Snowboard World Championships in Yabuli . After third place in the slopestyle at The Mile High in Perisher at the beginning of the 2016/17 season, she came in the top ten six times in the World Cup, including third place in Big Air in Mönchengladbach and thus reached eleventh place in the Freestyle World Cup and sixth place in the Big Air World Cup. At the Snowboard World Championships 2017 in Sierra Nevada , she won the bronze medal in slopestyle and took 14th place in Big Air.
In the 2017/18 season she took second place in Slopestyle in Cardrona and in Beijing and Mönchengladbach in Big Air and thus achieved second place in the Slopestyle World Cup and Big Air World Cup and first place in the Freestyle World Cup. At the 2018 Winter Olympics in Pyeongchang in the Big Air, which was held for the first time as part of the Olympic snowboard competitions, she came in eighth behind Austrian Anna Gasser on February 22nd . In the Slopestyle, she took 19th place there. In the 2018/19 season she came second in Big Air at the World Cup in Cardrona, Modena and Beijing. She also won the Slopestyle in the Secret Garden Ski Resort and on the Kreischberg , winning the Freestyle and Slopestyle World Cup. In the Big Air World Cup, she came second. At the season highlight, the Snowboard World Championships 2019 in Park City , she came in 17th place in slopestyle. In early March 2019, she finished third in slopestyle at the Burton US Open in Vail . In mid-December 2019 she won the Big Air World Cup in Beijing ahead of Anna Gasser. At the Winter-X-Games 2020 in Aspen she won the gold medal and at the X-Games Norway 2020 in Hafjell in Big Air. In February 2020 she was third in the Slopestyle at the Burton US Open.
Japan
World cup
TTR World Snowboard Tour
