TENNIS NO OUJI-SAMA: ATOBE KARA NO OKURIMONO - KIMI NI SASAGERU TENIPURI MATSURI

Hyoutei Gakuen's strange (but impossibly wealthy) captain Atobe Keigo decides to throw a giant birthday party for his friend and teammate Kabaji. He invites the rest of the Prince of Tennis cast. Together they participate in many different sports and events: dancing, swimming, soccer, a relay race, and more. (Source: Anime News Network) — Description from AniList community (anilist.co).