Mio Narita Cranks Out New Japanese National High School Record In 200 IM

2025 JAPAN SWIM

• Thursday, March 20th – Sunday, March 23rd
• Tokyo Aquatics Centre
• LCM (50m)
• SwimSwam Preview #1
• SwimSwam Preview #2
• Meet Central
• Live Results

The 2025 Japan Swim kicked off today from the Tokyo Aquatics Centre, site of swimming action at the 2020 Olympic Games.

One of the marquis events on day one was the women’s 200m IM and Mio Narita ensured her presence was known to kick off her campaign.

18-year-old Narita cranked out a time of 2:09.68 to beat the field by nearly a second en route to capturing the gold.

Shiho Matsumoto was next to the wall in 2:10.61 while Shuna Sasaki rounded out the podium in 2:11.80.

Narita’s result represents a new lifetime best for the teen, overtaking her previous PB of 2:10.11 logged at last year’s Konami Open for her first-ever foray under the 2:10 barrier.

Additionally, Narita’s performance tonight established a new Japanese National High School Record.

Three-time Olympian Rikako Ikee held the previous benchmark with the 2:09.98 she put on the books in 2017.

Splits for Narita this evening included 28.35/33.52/36.90/30.91 to become Japan’s 5th-swiftest performer of all time.

Top 5 Japanese Women’s LCM 200 IM Performers All-Time

1. Yui Ohashi – 2:07.91, 2017
2. Kanako Watanabe – 2:08.45, 2015
3. Rika Omoto – 2:08.65, 2019
4. Miho Teramura – 2:09.55, 2021
5. Mio Narita – 2:09.68, 2025

Narita’s performance now inserts her into the season’s world rankings in slot #2. Her new high school record also easily cleared the 2:12.83 World Aquatics ‘A’ standard needed for this summer’s World Championships. Matsumoto’s silver medal-worthy outing of 2:10.61 also made the grade.

After the race, Narita told Nikkan Sports, “It’s [breaking the record] always been my goal. I’m so happy.”

Looking ahead to the 400m IM, Narita stated, “I want to do my best to get a personal best of 4 minutes 34 seconds.”