Soundless voice [vocaloid song] (advanced) by Arr. Lilianialoy 

Try the interactive tutorial, or download the Sheet music here: musescore.com/...
--SEE UPDATE BELOW--
This was created as a pastime in between studying so some parts are worse than others. The actual refining of the song might have to be when I get time to play it out on the piano.
I am going by Gakupo's edition; I like the rhythmic insecurity it portrays, so expect some deviation from Len's version.
UPDATE: I actually played this out on the piano today. I practiced for a good 45 minutes and got it half decent, so this is definitely an advanced level transcription (even without the final additions!) I'm thinking it's probably a RCM level 7-9 piece. With the final additions it will definitely be at least RCM level 8. The final additions will have to be in a month or so because I have exams now, and I can't refine things when I have exams...my mind won't be set on music.
UPDATE 2: I'm going to consider this done because it took me long enough.