Is Tennis no Oujisama: Oshougatsu Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2003 · 1 episodes · PG-13 - Teens 13 or older
Shounen, Sports
The New Year has finally arrived for the Seishun Academy Boys' Tennis Team. As part of the festivities, Ryouma Echizen and his fellow first-year club members—Satoshi Horio, Kachirou Katou, and Katsuo Mizuno—celebrate by reminiscing about the past year. As the freshmen revel in nostalgia, it seems as if a strange hanetsuki tournament has begun among the rest of the team. [Written by MAL Rewrite]
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