TENNIS NO OUJI-SAMA OVA ANOTHER STORY: KAKO TO MIRAI NO MESSAGE

An OVA series covering the past and the future of the regulars that participated in the National Tournament. Volume 1 features two episodes, one starts with an episode featuring Seigaku visiting Osaka for a practice match with Shitenhouji, and an episode featuring Atobe's start at Hyoutei in his first year. Volume 2 also features two episodes, one starts with the second part of Seigaku's visit to Osaka, and an episode on Kirihara's start at Rikkai in his first year. — Description from AniList community (anilist.co).