Is Kansen 2: Inzai Toshi hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2010 · 2 episodes · Rx - Hentai
Hentai
Kansen 2 (like the first episode) takes place during the initial outbreak of the Unknown virus epidemic, but the protagonists here have a much harder lot because they are stuck in the middle of a contaminated city immediately after its destruction by a mysterious cataclysm. Stalked by hordes of infected maniacs, Hiroshi Ookura and his friends seek safety inside a mostly intact shopping mall, but madness and death are everywhere... (Source: VNDB)
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