Studying with Big Sisters / Kateikyoushi no Onee-san The Animation

The main character of the hentai, Touya-kun, is an ordinary guy who transfers to another school and moves in with relatives. However, upon arrival, he finds four sexy girls who turn out to be his new teachers - the English teacher Onodera Rio, the math teacher Shiono Nagisa, the biology teacher Amamiya Amane, and another teacher, Akizuki Sara. Now they will diligently teach our dullard, not stinting on love and affection...