Is Kansen 5: The Daybreak hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2012 · 3 episodes · Rx - Hentai
Hentai
Oogami Island is normally a peaceful isle with lush green scenery, but is now a place of depraved wanton lust. The contagion Unknown - Level 4 has become epidemic. 3 girls, Hyuuga Natsu, Ochi Akari, and Hanazawa Airi find themselves trapped in a sports facility where they are assaulted by the infected. (Source: AnimeNfo)
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