^ I think they mean this one
https://www.youtube.com/watch?v=lTJv2sxE16U
It says something along these lines (I used the Spanish translation for the first line because I wasn't completely sure about that one, and I translated the rest from Japanese):
"During the last 15 years, you've been there for me.
Your smile supported me.
Your tears were my courage.
Since you didn't give me up,
our dream is still continuing."