Is Shin Koihime†Musou: Gunyuu, Minami no Shima de Bakansu wo Suru no Koto - Ato, Porori mo Aru yo! hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, Fantasy
The story takes place at St. Francesca Academy. After the battle between the students ended, they all go to a southern island.
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