Nihira began curling in 2014 after being selected as one of the first group of students for the Hokkaido Talent Athlete Discovery Development Project.

[3] Playing third on the team, skipped by Momoha Tabata, Nihira won a bronze medal at the 2022 Japan Curling Championships.

[4] Nihira skipped the Japanese team, which also consisted of Tabata, Yuina Miura, Mikoto Nakajima and Yui Ueno, at the 2024 World Junior Curling Championships.

In the playoffs, the team defeated Norway (skipped by Torild Bjørnstad) in the semifinal before losing to Switzerland (Xenia Schwaller) in the final, settling for a silver medal.

The team made their Tier 1 Grand Slam debut at the 2024 Canadian Open, where the finished with a win-less 0–4 record.