Shin Sei Yariman Gakuen Enkou Nikki The Animation
Genres: Hentai
Type: OVA, Episodes: 1
Aired: Jun 27, 2014
Studio: Seven
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
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)