is a Japanese competitive swimmer. At the 2022 Junior Pan Pacific Championships, she won the gold medal in the 200 metre butterfly and silver medals in the 100 metre butterfly and 4×100 metre medley relay. At the 2022 World Short Course Championships, she placed sixth in the final of the 200 metre butterfly.

Career 2022 Junior Pan Pacific Championships

On the first day of competition at the 2022 Junior Pan Pacific Swimming Championships, held in August at the Veterans Memorial Aquatic Center in Honolulu, United States, Mitsui won the gold medal in the 200 metre butterfly with a Championships record and personal best time of 2:07.82, which lowered the mark 0.66 seconds from the 2:08.48 set by Cassidy Bayer of the United States six years earlier.De George, Matthew (24 August 2022). "Junior Pan Pacs: Erin Gemmell Sets Second Meet Record to Win 200 Free; Aaron Shackell Shines in 200 Fly". Swimming World. Retrieved 21 December 2022.Penland, Spencer (25 August 2022). "Airi Mitsui Shatters Jr Pan Pacs Record in Girls 200 Fly as Japan Goes 1-2". SwimSwam. Retrieved 21 December 2022. The following day, she placed thirty-second in the 100 metre freestyle preliminaries with a personal best time of 57.79 seconds and did not advance to the evening finals.Hy-Tek (24 August 2022). "2022 Jr Pan Pacific Swimming Championships: Results". swmeets.com. Retrieved 21 December 2022. Day three of four, she won her second medal, this time finishing in a personal best time of 58.67 seconds in the final of the 100 metre butterfly to win the silver medal 0.09 seconds behind gold medalist Alex Shackell of the United States.Lohn, John (26 August 2022). "Junior Pan Pacs – Day 3 Finals: Erin Gemmell Completes Freestyle Triple; Alex Shackell Is Golden". Swimming World. Retrieved – December 2022. The fourth and final day, she started the evening finals session with a third-place finish in the b-final of the 200 metre individual medley with a personal best time of 2:15.94 before winning a silver medal as part of the 4×100 metre medley relay, where she split a 58.76 for the butterfly leg of the relay to contribute to the final time of 4:04.01. When points for individual competitors were summed at the end of competition per the points they earned for their place-finishings in events, Mitsui ranked as the tenth-overall highest-scoring female competitor.Lepesant, Anne (28 August 2022). "Erin Gemmell, Joshua Staples Top the Points Tables at 2022 Junior Pan Pacs". SwimSwam. Retrieved 21 December 2022.

2022 World Short Course Championships Leading up to the 2022 World Short Course Championships, Mitsui competed at the 2022 Japan Short Course Championships in October in Tokyo, winning the gold medal in the 200 metre butterfly with a personal best time of 2:04.35 and placing seventh in the 100 metre butterfly with a personal best time of 57.85 seconds. As an 18-year-old at the 2022 World Short Course Championships, conducted at Melbourne Sports and Aquatic Centre in Melbourne, Australia in December, she ranked fifth in the preliminaries of the 200 metre butterfly on day three with a time of 2:05.27 and qualified for the evening final.FINA (15 December 2022). "16th FINA World Swimming Championships (25m) Melbourne (AUS): Women's 200m Butterfly Heats Results Summary". Omega Timing. Retrieved 21 December 2022. In the evening final, she placed sixth with a time of 2:05.40, finishing after a gold-silver sweep by two American swimmers and 5.79 seconds behind the world record of 1:59.61 set by Mireia Belmonte of Spain in 2014.FINA (15 December 2022). "16th FINA World Swimming Championships (25m) Melbourne (AUS): Women's 200m Butterfly Final Results". Omega Timing. Retrieved 21 December 2022.De George, Matthew (15 December 2022). "World Championships, Day Three Finals: Dakota Luther, Hali Flickinger Go 1-2 in 200 Fly". Swimming World. Retrieved 21 December 2022.Pérez, Marta (15 December 2022). "McKeon y King reinan an respectivamente en 100 libre y en 100 braza" (in Spanish). Mundo Deportivo. Retrieved 21 December 2022.

2023 In the preliminaries of the 100 metre butterfly on day one at the 2023 Japan Swim in April in Tokyo, Mitsui ranked sixth with a time of 58.96 seconds."Japan Swim 2023: Results Summary Women 100m Butterfly Heats". Seiko. 4 April 2023. Retrieved 4 April 2023. She lowered her time to a 58.87 in the final and placed seventh."Japan Swim 2023: Results Summary Women 100m Butterfly Final". Seiko. 4 April 2023. Retrieved 4 April 2023. With a time of 2:09.33 in the morning preliminaries of the 200 metre butterfly on the third morning, she qualified for the final ranking first."Japan Swim 2023: Results Summary Women 200m Butterfly Heats". Seiko. 6 April 2023. Retrieved 6 April 2023. She achieved a personal best and 2023 World Aquatics Championships and 2022 Asian Games qualifying time of 2:06.77 in the final, winning the gold medal by 0.68 seconds and lowering her previous personal best time by 1.05 seconds."Japan Swim 2023: Results Summary Women 200m Butterfly Final". Seiko. 6 April 2023. Retrieved 6 April 2023.Shintaro, Kano (6 April 2023). "Japan Swim 2023: All results and medals from Japanese swimming national championships - complete list". Olympics.com. Retrieved 6 April 2023. In May, at the first stop of the 2023 Mare Nostrum tour, in Canet-en-Roussillon, France, she won the gold medal in the 200 metre butterfly with a time of 2:09.13."Canet-en-Roussillon: Day 2 Results (2023) | Mare Nostrum Swim Tour". Mare Nostrum. 14 May 2023. Retrieved 14 May 2023.

International championships (50 m) Meet100 freestyle100 butterfly200 butterfly200 individual medley4×100 medley PACJ 2022(age: 18) 32nd(57.79) (58.67) (2:07.82 CR) 3rd (b)(2:15.94) (split 58.76, fl leg)

International championships (25 m) Meet200 butterfly WC 2022(age: 18) 6th(2:05.40)

Personal best times Long course meters (50 m pool) Event Time Meet Location Date Age Ref 100 m butterfly 58.67 2022 Junior Pan Pacific Championships Honolulu, United States 26 August 2022 18 200 m butterfly 2:06.77 2023 Japan Swim Tokyo 6 April 2023 18 200 m individual medley 2:15.94 b 2022 Junior Pan Pacific Championships Honolulu, United States 27 August 2022 18 Legend: b – b-final

Short course meters (25 m pool) Event Time Meet Location Date Age Ref 100 m butterfly 57.85 2022 Japan Short Course Championships Tokyo 23 October 2022 18 200 m butterfly 2:04.35 2022 Japan Short Course Championships Tokyo 22 October 2022 18

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