Is Dog Days'': Limone Resort Tenbou Onsen! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · PG-13 - Teens 13 or older
Ecchi, Fantasy, Isekai
Special episode delivered to customers who pre-order all six Blu-ray and DVD volumes of Dog Days''.
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