# Japanese high school baseball 2026 > Live situation record from CLSTR: https://clstr.news/situations/japanese-high-school-baseball-2026 > Updated: 2026-08-17T03:16:21.000Z. Sources: 12. Developments: 4. In June 2026, the Japan High School Baseball Federation reported a continued decline in participation for the 108th national tournament, with 3,662 schools and 3,363 teams entering—down from the previous year and part of a downward trend that began in 2021. The report highlighted regional differences, noting Aichi prefecture as having the most teams and Tottori the fewest, and referenced the historic 1972 tournament to underscore the sport’s long-standing cultural significance. By late July 2026, the season’s activities continued despite the shrinking field. The Shizuoka high-school baseball club posted its full schedule, and Akita Prefecture released the national tournament programme. A notable performance came from pitcher Kawashima Kenshin of Ryutoku Daheian, who delivered a 151 km/h fastball and led his team to the Kyoto regional quarter-finals before being eliminated on 22 July 2026. In response to the long-term decline in participation—which includes a 26% reduction in players since 2014—the Japan Summer League (JSL) 2026 commenced on 17 August at Koza Shin-Kin Stadium in Okinawa. Organized by Japan League Co., Ltd. in partnership with K.O.H., the event features 36 high school seniors from 27 schools who did not qualify for the Koshien tournament. The league utilizes advanced technology like TrackMan and BLAST for data-driven coaching, with former professional pitcher Yuto Akagami serving as pitching coordinator. The tournament aims to provide high-level analytical feedback and career education through a “sports open campus” format. ## Claims - The Shizuoka High School baseball club posted its official 2026 season schedule on its website. (single source) - Akita Prefecture’s newspaper released the national 2026 high‑school sports tournament programme on 27 July 2026. (single source) - Kawashima Kenshin of Ryutoku Daheian recorded a 151 km/h fastball in spring 2026. (single source) - Ryutoku Daheian was eliminated in the Kyoto regional quarter‑finals on 22 July 2026. (single source) ## Timeline ### 2026-08-17: Japan Summer League 2026 opens in Okinawa for high school baseball players The Japan Summer League 2026 opened in Okinawa, providing 36 high school baseball players who missed Koshien a competitive platform with professional coaching and advanced data analytics. 4 sources. https://clstr.news/cluster/japan-summer-league-2026-opens-in-okinawa-for-high-school-baseball-players ### 2026-07-27: Japan Summer League 2026 to boost declining high‑school baseball in Okinawa Japan League and K. O. H partner to run Japan Summer League 2026 in Okinawa, aiming to revive high‑school baseball participation amid a decade‑long decline. 2 sources. https://clstr.news/cluster/japan-summer-league-2026-to-boost-declining-highschool-baseball-in-okinawa ### 2026-07-25: Japanese High School Sports 2026: Schedules and Baseball Highlight Shizuoka high school baseball posts its 2026 schedule; Akita releases Japan's 2026 national high‑school sports programme; Ryutoku Daheian pitcher Kawashima throws 151 km/h in spring but loses in Kyoto quarter‑f 4 sources. https://clstr.news/cluster/japanese-high-school-sports-2026-schedules-and-baseball-highlight ### 2026-06-27: Japan’s high school baseball sees continued drop in team participation Japanese high school baseball participation fell to 3,662 schools for the 108th tournament, continuing a yearly decline; a 1972 Kyoto tournament archive is also noted. 2 sources. https://clstr.news/cluster/japans-high-school-baseball-sees-continued-drop-in-team-participation --- Cite as: Japanese high school baseball 2026. CLSTR, https://clstr.news/situations/japanese-high-school-baseball-2026