Kateikyoushi no Onee-san The Animation

Toyah-kun, the protagonist of this hentai, is an ordinary young man who enrolls in a new school and moves in with relatives. Upon arriving, he meets four attractive female teachers: Rio Onadera for English, Nagisa Shiono for math, Amane Amamiya for biology, and Sarah Akizuki, another teacher. These women are determined to train him rigorously, showing no mercy in their pursuit of excellence.