Tomitaka started the World Cup for the first time in Ruka in December 2015 and finished sixth in the Dual Moguls. At the Junior World Championships in Åre in 2016 , she won gold in the Dual Moguls and also came seventh in the Moguls. The following year she came eighth in the Moguls and Dual Moguls at the Winter Asian Games in Sapporo . In the 2017/18 season she became Japanese champion in the Moguls and won silver in the Moguls competition at the 2018 Junior World Championships in Duved . In the following season she reached ninth place in the Moguls World Cup with three top ten placements. At the season highlight, the 2019 World Championships in Park City , Moguls and Dual Moguls took eighth place. At the beginning of April 2019 she won the silver medal in Moguls and Dual Moguls at the Junior World Championships in Chiesa in Valmalenco . In the 2019/20 season she came in ten World Cup starts, three times in the top ten and thus reached 12th place in the Moguls World Cup.