Relics of Cloud was first uploaded on November 26, 2011, sung by Hatsune Miku and MEIKO. It did not get many attention, with over 20,000 views (a revised version uploaded a month after of it, reach 200,000.). Yanagi-P then uploaded a Len version of the song on December 29, 2011, which reached over half a million views. That song was also given the title "Legendary LEN Master" for Yanagi-P's fine tuning of Len there. Len's version was more preferred, with more derivatives or covers with Len's arrangement/version.It's also featured in the EXIT TUNES compilation album Vocalostar.