[2][5] She initially trained at the Howa Sports Land Skating Club in Aichi, where she was coached by Hiroshi Nagakubo, Yoriko Naruse, Miho Kawaume, and Yuko Hongo.

[6][7] Kushida ultimately relocated to Uji, Kyoto in 2020 however to train at the Kinoshita Academy under coaches Mie Hamada, Satsuki Muramoto, and Hiroaki Sato.

[1][10] Kushida made her international debut on the Junior Grand Prix at the 2022 JGP Czech Republic, where she won the bronze medal.

[12] Kushida went on to compete at the 2023–24 Japan Junior Championships, unexpectedly winning the short program ahead of overwhelming favourite, Mao Shimada.

[16] At those championships, Kushida finished twenty-fifth in the short program and did not advance to the free skate segment of the competition.

[17] At the 2024 World Junior Championships in Taipei, Kushida finished third in the short program, winning a bronze small medal for the segment.