Due to popular demand, I've uploaded the mp3 for this song. It's just a rip from the video, since this is an original creation and not commercial music.
http://www.megarotic.com/?d=780679HO
By the way, I didn't find this video; it was meg9-9 who brought it to FAKKU's attention by posting it here. So thank her, not me; all I did was put it on the front page. XD
And like I said before, I won't translate the entire thing, but as a concession I'll translate the narration at the end, which is quite a fitting summary of the whole thing.
It really was a miracle.
The robot that was given the name 'Kokoro' sang of all the feelings that came to her.
However, this miracle was temporary.
Her robot body was unable to withstand the weight of the word 'Kokoro', and thus she never moved again.
However, she left behind a pleasant smile on her face.
She looked like, she really did look like, an angel.
Anyway, here's an explanation of what was meant by the 'weight of the word Kokoro':
There's more to "Kokoro" than just a name. It was the one thing she's unable to do. After she looks at the pictures of the girl she was modeled after, she is finally able to use it (ie. feel sad). And with that, she lays down and destroys her own circuits, never to wake again.