Is Takamiya Nasuno desu! Teekyuu Spin-off hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2015 · 12 episodes · PG-13 - Teens 13 or older
Comedy, Shounen
A spin-off from Teekyuu which centers on the daily life of Nasuno Takamiya, the "exceedingly airheaded" school tennis club member in Teekyuu, and her friends.
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