Shin Sei Yariman Gakuen Enkou Nikki The Animation

Based on the doujin game by Orcsoft. Saiki Yasuo is a 45-year-old office worker. After 20 years of marriage, his wife demanded a divorce and left him. Now, spiraling into depression, he spends his long nights drinking alone—until one night, a girl from the Shin Sei Yariman Academy approaches him in search of a “client.”