Ama Nee -Osananajimi Onee-chan to no Echi Echi Amayakasare Dousei Seikatsu-

The childhood friend who was like an older sister is back as a student teacher!? Utsumi Shuuhei, the protagonist, had a childhood friend, Anekouji Amano, whom he affectionately called "Ama-nee." However, after her family moved far away due to her parents