She won a gold medal in the mixed team event at the 2024 World Judo Championships held in Abu Dhabi, United Arab Emirates.

[1] In her first year, Arai faced Hilal Öztürk of Turkey in the final of the 2022 World Junior Championships, where she scored a waza-ari with an uchi-mata and then pinned her down, initially winning with a combination technique, but the ippon was revoked for grabbing below the belt and throwing her.

[11][12] In her second year, she placed third in the weight class semi-finals, losing to Hikaru Kodama of SBC Shonan Beauty Clinic with an ouchigari.

[13] In the delayed 2021 World University Games, she lost her first match by disqualification to Agatha Martins Silva of Brazil.

[25] At the Asian Championships, Arai lost by disqualification to Mongolia's Amarsaikhany Adiyaasüren in the quarterfinals, but won the repechage round to finish third.