泡沫ノ幻想 (Utakata no Gensou)

Background
"Fantasies of the Foam" is a song composed by Shigotoshite-P first uploaded on August 11th 2010. It's Shigotoshite-P's first original work with Kagamine Len as the main vocals.

Shigotoshite-P's previous work "Aqua" was technically her first work to feature the Kagamine Rin and Len, however Shigotoshite-P stated the song "Aqua" was just a "test" to try the Kagamines. Ten days later Fantasies of the Foam was uploaded.

According to Shigotoshite-P's blog, the person Len sings this song to (addressed "you" is "my" / Len's existence for living). Having to search with countless effort he could not find his "reason" to live.