Hey, good work!
I used to be a really big Yui fan(and still am, I guess, although not as much) so I know the song pretty well. Anyways, the first thing I want to mention is probably the volume. The vocals are too quiet compared to the instrumental. We can't hear your pretty voice! Still, that might be something hard to control and if your mike isn't too good there is really nothing you can do about it.
Anyways, I think your voice is really pretty. I can't really hear the lyrics too well, so I can't really comment on your Japanese too well, but it sounds like your knowledge of the language is decent. Do you know Japanese or are you just singing along? I have done karaoke songs in Spanish before even though I can't speak it.
Anyways, no tomatoes thrown here, well done.