Sensei dakara Seito no Koibito ni wa Narenai kedo SeFri ni nara Natte Agerareru yo.

先生だから生徒の恋人にはなれないけど友達にならなってあげられるよ。, As A Sensei, I Can't Become A Student's Lover, But I Can Be Your Fuckbuddy 2