[16][11] Originally a singles skater, she competed at the 2012–13 and 2014–15 Japan Junior Championships, finishing fifteenth and fourteenth respectively.

[18] Given the lack of training rinks to practice ice dance in Japan, Orihara decided to move to British Columbia, Canada after a Japanese skating coach introduced her to Canadian ice dance coaches Megan Wing and Aaron Lowe.

[20] In spring 2019, Finland-based Italian ice dance coach, Maurizio Margaglio, who was acquainted with Orihara's then coaching team, contacted them, requesting that Orihara travel to Helsinki to have a try-out with his then partnerless student, Juho Pirinen.

Orihara agreed to this request and following a successful tryout, she soon moved to Finland to train with Pirinen.

[15][8] Deciding to represent Finland, the duo made their international debut at the 2019 CS Lombardia Trophy, where they finished eleventh.

[22] Selected to compete at the 2020 European Championships in Graz, Austria, the duo came in eighteenth place.

[21][1] Although Orihara/Pirinen were assigned to make their Grand Prix series debut at the 2020 Internationaux de France, the event was cancelled due to the COVID-19 pandemic.

They would follow it up with a fourth-place finish and a gold medal at the 2021 Trophée Métropole Nice Côte d'Azur and the 2021 NRW Trophy, respectively.

Orihara/Pirinen would then end their season by winning silver at the 2022 Bavarian Open and bronze at the 2022 International Challenge Cup.