It was really good, clear story, nice crossover and neat editing overall. A great video! My main complain though would be about the colors who don't really match between both animes, like it looked like Toradora had one type of cc and Euphonium a lighter one which is a pity because it creates a wider gap between the animes. Also in the flashback(?) parts some scenes were a bit too bright to make out what was going on.
Still very good, I hope you place well, good job o/