She had a clean free skate despite an under-rotation on a jump combination and won the bronze medal behind Russia's Anastasia Tarakanova and Anna Shcherbakova.

[3] In her lone Junior Grand Prix appearance for the year, Sumiyoshi finished eighth at the 2019 JGP Latvia.

[5] At 2021–22 Japan Junior Championships, Sumiyoshi was first after the short program but won the silver medal overall after a third-place free skate.

In response to the invasion, the International Skating Union banned all Russian and Belarusian athletes from competing at ISU championships.

[9] However, due to both the invasion and concerns related to the Omicron variant, the World Junior Championships could not be held as scheduled in Sofia in early March, and they were later moved to mid-April in Tallinn, Estonia.

[12] During the 2022–23 figure skating season, Sumiyoshi made her senior debut on the ISU Grand Prix series.

[15] She fell twice in the free skate, including on her downgraded quad attempt, placing fourth in that segment but remaining third overall by a margin of 4.12 points over American Audrey Shin.

[3] Named to the Japanese team for the 2023 Winter World University Games, she came fourth at the event, nine points back of bronze medalist Kim.

She finished 1.04 points behind silver medalist Nina Pinzarrone of Belgium and said afterward that she was "most happy about the quad toe because I've been working on it," adding that "there were some small mistakes, I think I showed great growth that I was able to put it all together.

[20][19] At the 2023 Grand Prix of Espoo, Sumiyoshi finished narrowly second in the short program behind reigning World champion Kaori Sakamoto.

"[21] At the 2023–24 Grand Prix Final in the short program, Sumiyoshi received a quarter underrotation call on the second half of her jump combination and doubled a planned triple Lutz; she finished fifth there.

During her first event at the 2024 Grand Prix de France, she placed fifth in the short program but second in the free skate, where she landed an attempted quad toe loop on two feet.

[28][29] One month later, Sumiyoshi competed at the 2025 Winter World University Games, where she placed third in the short program but won the free skate, taking the gold medal overall.