DAYS OVA

In the anime bundled with the 21st manga volume, the Seiseki team members encounter their Sakuragi High School rivals at a summer training camp, and a random incident leads to a beach soccer all-star game between the two teams. The anime bundled with the 22nd manga volume depicts the traditional games played at the Kagoshima training camp, where the best from around the country have assembled. — Description from AniList community (anilist.co).