Is Shin Sei Yariman Gakuen Enkou Nikki The Animation hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2014 · 1 episodes · Rx - Hentai
Hentai
Based on a doujin game by Orcsoft. Saiki Yasuo is a 45 years old office worker. After 20 years of marriage, his wife asked for a divorce and left him. Now, depressed, he spends the nights drinking alone, until one night a girl from the St. Marian Academy approaches him looking for a client. (Source: English DLSite)
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