Its about this male student who plays baseball. A new teacher becomes his homeroom teacher or something but they end up having this secret relationship. Male student/Female teacher.

I recall there being drama and how his friend finds out about his relationship.

I did look under the tags but I couldn't find it. I even checked mangapark just now with the genres: romance, school life and drama. I can't recall if its seinen or shoujo.

I recall the art being really pretty.

Probably Natsuzora and Run?

This is it! Thanks! 😀 🙂