Yukio, called by his friends 'Koyuki', is a normal highschool boy with no dreams or expectations of his life or whatsoever. This changes when he saves a strange looking dog, named Beck, from some gangsters. Beck's owner, Minami Ryuusuke, turns out to be an emerging rock musician and impressed by his guitar skills, soon Koyuki finds himself wanting to learn to play the guitar as well and this changes his life once and for all.
Keeping in mind that I didn't read the manga or watch the anime: I loved it.
First thing: the music. The story is fluid and it caught my attention since the very first second, but the music is so wickedly pleasing. I don't know if they're actually originals but they are pretty convincing.
With that said, I have to say that both Mizushima Hiro (who plays Ryuusuke) and Kutsuna Shiori (who plays Maho, Ryuusuke's sister) spend more than half of the movie speaking VERY good English. To be honest, I was expecting it from Hiro since I saw him speaking English before and he studied abroad, but the girl surprised me in a very positive way. There was no Engrish in this movie. And Mizushima's acting fits his character so well; I loved him. Then Mukai Osamu... no words for him... I don't know how's the actual character in the manga, but in the movie he is so hot and cool. Almost fainted. Kiritani Kenta as Chiba gives that funny or comical touch to the whole thing, but also the willing of fighting for something someone wants and loves. And Sato Takeru... I don't like this guy at all and normally I think he looks as if he was scared all the time, but he plays the cutest Koyuki ever. He manages to have these honest, wide eyes that make you want to hug him all the time.
Another very good point, that I think gives the movie a beautiful touch, is that you never get to hear Koyuki's voice. He sings, but you don't hear his voice, so instead of focusing in Sato Takeru's singing you focus in the environment, the situation and the feelings he causes in people. I think it was a good decision and a wise move.
I highly recommend this movie, especially for its music. And... Did I said before that they're almost perfect?