"Kimi ni Sasagu Fantasia" was first uploaded on May 31, 2010; a VOCAROCK song, with a fantasy-like themed. It was PolyphonicBranch's first work using Kagamine Len, and is among some of his notable work. The song is relatively popular, and has reached Nico Hall of fame, with currently over 200,000 views to date. During the Kagamine Appends' release, Kimi ni Sasagu Fantasia became one of the demos for Len's Append voicebanks "Cold" and "Serious". It was also labeled by Karen-T, making it purchasable in Listen Japan, iTunes store, TSUTAYA RECORDS, and more.