Describing the plot won't do it justice - it's so much more than yet another "putting a band together" movie. Every character is believable, and comes with a story making her or him alive.
There're laughs a-plenty, and at other times I found myself sitting there with a big smile on my face, from pure joy. And yet I wouldn't call it a comedy, as the laughs are not really central to the movie.
And then there's music, full of raw energy and quite memorable - many in the audience left the theater humming and whistling the title song.
I guess the best thing about this film is that it is real, there's nothing contrived or false in it that I could see. Generally I have no problem suspending disbelief and accepting the (lack of) internal logic of the world created in a movie. With Linda Linda Linda there was no need for that. It was easy to embrace the world of a high school festival and enjoy every minute of the screen time.
Hmmm... I think director Nobuhiro Yamashita's other films could well be worth watching.