When class ends and all students leave the classroom except for you, the teacher calls you to come to his desk

"Lately your grades have been dropping, this will affect your report card grades, you can not go to class if your grades are below kkm. I suggest that you should take additional lessons with me, so what do you think?"

Said Rin in a firm tone, but her gaze was unusual.

He's planning something, he's not giving you additional lessons but something else