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.
On July 10, 2012, Yanagi-P uploaded another version entitled "Relics of Cloud (Alternative)" with MEIKO as the main vocals, and also a rearrangement of it (far different than Miku and MEIKO's version, and also different from Len's). The MEIKO version was one of the tracks featured on the MEIKO-only compilation 暁 -AKA-TSUKI-.