Anime Sex - Shin Sei Yariman Gakuen Enkou Nikki

Based on the doujin game of the same name by Orcsoft Saiki Yasuo is a 45-year-old office worker who works in Tokyo. In the midst of their 20-year marriage, his wife filed for divorce and abandoned him. Now that he is despondent, he spends his evenings drinking alone, until one night, a girl from the St. Marian Academy approaches him in need of work.