[6] In March, she placed eighteenth in the short, eighth in the free, and ninth overall at the 2019 World Junior Championships in Zagreb, Croatia.

[6] In April, she was invited to skate in the gala at the 2019 World Team Trophy as the Japan junior national champion.

In October, making her senior international debut, Yokoi won the bronze medal at the 2019 CS Finlandia Trophy.

In November, she competed at two Grand Prix events, placing sixth at the 2019 Rostelecom Cup and fourth at the 2019 NHK Trophy.

[6] With the COVID-19 pandemic limiting international competitions, Yokoi was assigned to compete at the 2020 NHK Trophy, which was attended almost exclusively by Japanese skaters.

[6] She was ninth at the 2021 Internationaux de France, saying that she was very pleased with her free skate: "I still wonder if I should continue, and when I have a good performance, I am truly happy, and that is why it keeps me going.

[12] In her lone Grand Prix assignment of the year, Yokoi finished eighth at the 2022 Skate Canada International.