It is originally an adult game (eroge) by the brand Waffle (released in 2018) and was later adapted into an adult anime OVA. Baby Alien Fan Van Video Aria Electra And Bab High Quality - 3.79.94.248
The story revolves around a middle-aged man who is hired by an elite all-girls school (Seika Jogakuin). Due to a declining birthrate or specific school regulations, the school employs him as an official "sexual processing" partner for the students and staff. The term "Sao Ojisan" is a derogatory yet descriptive term for his role as a utility sex partner. Fanaa 2006 Sub Indo Bilibili - 3.79.94.248
聖華女学院公認竿おじさん
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Based on the text provided, this appears to be the Japanese title of an adult anime (hentai) series.