It has same theme which is bullying. It also has great cinematography and pacing is somewhat similar to this drama. I won't say if it will have a happy ending, that's for you to find out.
both directed by the same director...those shots, that cinematography and the background music will feel the same. Kanojo is more mainstream and taiyou no uta is more indie but nontheless both yui and sakurako are tremendous singers.
You may ask why I recommend this one, its not a deaf movie but if you love this movie for that romance thing then you will totally love this. A not so pretty girl and a optimistic guy, same style and same music too.
tho this has a different plot it shows beautiful cinematography of mountains and trees too + great character development....also the chemistry between shun and yakusho is like the chemistry between sometani and hideaki. To oguri shun fans this is IMO his best performance so watch it LOL.