By Retta Race on SwimSwam
79th AICHI PREFECTURAL HIGH SCHOOL SWIMMING COMPETITION
Saturday, June 21st & Sunday, June 22nd Aquarena Toyohashi, Toyohashi City, Aichi Prefecture LCM (50m) ResultsWhile Japanese teenager Shin Ohashi is wreaking havoc in the men’s breaststroke events this weekend, another 16-year-old did damage in the 400m IM.
Competing at the 79th Aichi Prefectural High School Swimming Competition, fellow 16-year-old Yumeki Kojima blasted a new lifetime best of 4:11.67 to take the gold and beat the field by over 20 seconds.
Kojima’s previous career-swiftest performance entering this two-day competition sat at the 4:17.42 he notched at last year’s Japanese High School Championships. That means he hacked nearly 6 seconds off his previous PB en route to becoming Japan’s 10th-best performer of all time.
Splits for Kojima’s 4:11.67 are below.
Japanese Men’s Top 10 LCM 400 IM Performers All-Time
Kosuke Hagino – 4:06.05, 2016 Daiya Seto – 4:06.09, 2020 Tomoyuki Matsushita – 4:08.61, 2025 Asaki Nishikawa – 4:09.63, 2025 Kosuke Makino – 4:09.19, 2025 Tomoru Honda – 4:09.98, 2023 Yuya Horihata – 4:10.52, 2012 Takeharu Fujimori – 4:10.90, 2017 Kaito Tabuchi – 4:11.15, 2024 Yumeki Kojima – 4:11.67, 2025The teen checks in as Japan’s 4th-best performer of 2025, a year which has already seen Olympic silver medalist Tomoyuki Matsushita, Asaki Nishikawa and Kosuke Makino make dents in the nation’s all-time rankings.
In terms of the Japanese High School National Record, that remains at the 4:08.94 Olympic champion Kosuke Hagino put on the books at the 2012 Olympic Games.
For additional perspective, 16-year-old Kojima’s 4:11.67 performance would represent a new United States National Age Group Record, destroying the 4:14.73 Olympic medalist Carson Foster established in 2018. That overtook Olympic legend Michael Phelps‘ previous age group standard of 4:15.20 logged in 2001.
Kojima now ranks 12th in the world on the season.
2024-2025 LCM Men 400 IM
LeonFRAMARCHAND05/164:07.112BobbyFINKEUSA4:07.4606/053Carson Foster USA4:07.9206/064TOMOYUKIMATSUSHITA JPN4:08.6103/205ASAKINISHIKAWA JPN4:09.6303/206RexMAURERUSA4:09.6506/057KOSUKEMAKINO JPN4:09.7903/208Wang Shun CHN4:10.6405/249Gasa NishikawaJPN4:10.8006/0710Ilya BorodinRUS4:11.3904/1711Max LitchfieldGBR4:11.5904/1612Zhang ZhanshuoCHN4:11.8605/24View Top 26»The teen will be competing at this year’s World Junior Championships. His time tonight would have rendered him the silver medalist at the 2023 edition of the championships.
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