Is Koihime†Musou: Gunyuu, Seitoukaichou no Za wo Neratte Aiarasou no Koto - Ato, Porori mo Aru yo! hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2009 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, Fantasy, School
OVA of Koihime Musou in a school environment, where factions of 4 individuals fight off in school athletic events to obtain the positions of Student Council seats.
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