I forgot that they are not even in the same class, which makes the teacher just a P.E teach to her. Kudo to him for going out of his way to help her when her homeroom teach has failed his job.
I prefer the river scene in the manga to the one in the anime. It really shows how good it is, and how much his playing touched random by-passers. The same scene in the anime focused too much on Akine's fangirling over his performance and missed the point IMO.