This manga is more a drama than a comedy. It's about a student-teacher relationship. The teacher didn't want to give in and he has some policy that he doesn't want to overstep the boundaries of a romantic relationship but in the middle of the manga he finally gives in. They are happily mad in love together. But! I remember a scene when they are at a piano, kissing and a teacher saw them. It became a huge scandal and the teacher got fired. Then they send the student to counseling and he tries to convince them that it was mutual, and they love each other and he wanted this but nobody listens to him.

Do you know this manga?

Ano Kado wo Magatta Tokoro by Kawai Touko?

Yes, that's the one!! Thank you!