Is Natsu-iro Kiseki: 15-kaime no Natsuyasumi hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · PG-13 - Teens 13 or older
Slice of Life
A seven minute epilogue to the TV series, released as an OVA.
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