[4] This win qualified the Koana rink to represent Japan at the 2018 Ford World Women's Curling Championship[1] finishing in 10th.

She also represented Japan at the third leg of the 2018–19 Curling World Cup, finishing with a 2–4 record.

[5][6] The Koana rink was unable to win another Japanese Women's title, finishing 4th at the 2020 and 2021.

Koana and Aoki first represented Japan in mixed doubles at the 2025 Asian Winter Games, where they won the gold medal, beating South Korea 7–6 in the final.

Koana worked as an amusement park employee for Fujikyu Highland Co., Ltd.[1] until 2022.