Is Sora no Manimani hentai?
English title: At The Mercy of The Sky
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2009 · 12 episodes · PG-13 - Teens 13 or older
Comedy, Romance, School, Seinen
Saku Ooyagi returns to his hometown after seven years and is soon reacquainted with his childhood friend, Mihoshi Akeno. The reunion is far from merry since the last memory they have of each other is of her falling off a tree and him saving her. In any case, Mihoshi is determined to improve their relationship and forces Saku to join the astronomy club she founded.
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