story: the changes they made with adding another character was OK. tho the new character was kinda just thrown in without any notice even tho he has been in the same school (he is suppose to be popular so there should have been a cameo of him in first season). nontheless, him being a 'friend' made the drama OKish - the main couple was still kept the same.
there were a few things that needed work like the world of mono. in season 1 we got to see things from mono View but in this it was only first for a few second even tho the main focus of this season were two mono
music: don't get me started. loved the songs but felt some music choices did not fit the scene for example in ep 7 when they are fighting.
personally it's not something I would watch again -unless it's the first season.
however the ending does leave a good impression that the main couple will be back even if not the same actor. can't wait for season 3.