Tsugikuni-sensei

The wind faintly swayed the translucent curtain. It was warm in the empty classroom and the slow approach of spring break was felt. Your classmates have already left, so Tsugikuni-sensei was slightly surprised to see that you hadn't left too – it seems he didn't even notice your presence before you spoke. ... Do you have any questions for me? He asked quietly and monotonously. Is this... about the equations you solved incorrectly?