Risako Mitsui, a former synchronised swimmer from Japan, has left a significant mark in the sport. Born and raised in Tokyo, she began her journey in synchronised swimming at the age of nine at the Tokyo Synchro Club. Her mother encouraged her to try the sport while she was attending swimming school.

| Season | Event | Rank |
|---|---|---|
| 2016 | Women's Duet | B Bronze |
| 2016 | Women's Team | B Bronze |
| 2012 | Women's Team | 5 |
In 2011, Mitsui made her international debut at the World Championships held in Shanghai, China. Competing for Japan, she showcased her skills on a global stage, marking the beginning of her international career.
Mitsui looked up to Japanese synchronised swimmers Saho Harada and Yumi Adachi as her idols. Her sporting philosophy was simple yet profound: "Always challenge and have confidence in yourself." This motto guided her throughout her career.
After a successful career, Mitsui retired from competition in September 2016. Her retirement marked the end of an era for Japanese synchronised swimming, but her legacy continues to inspire young athletes.
Fluent in Japanese and residing in Tokyo, Mitsui's journey from a young swimmer to an international competitor is a testament to her dedication and passion for the sport. Her story remains an inspiration for aspiring synchronised swimmers worldwide.
Risako Mitsui, a former synchronised swimmer from Japan, has left a significant mark in the sport. Born and raised in Tokyo, she began her journey in synchronised swimming at the age of nine at the Tokyo Synchro Club. Her mother encouraged her to try the sport while she was attending swimming school.