I accidently deleted a song from my itunes?

Okay, so I had this song Suki Dakara (好きだから) by Izumi Katou that I forgot I had. So I was on ituned today, and I saw it, clicked it, and it said the source could not be found (and this happens to a lot of my songs because I transferred them over from a computer I had to trash), so I did the usual thing that works, but I chose the wrong song, and deleted the other one. Now I can't find it anywhere on my computer. I lost the cd I got it from, and I can't remember where I got it from, it was a present. Where can I download it T_T? I don't care if it has dialouge in it. Like I heard this one verison once, where this guy was talking and saying 'I love you' in japanese and the begining, and that's all I remember...