"Fantasies of the Foam" is a song composed by sigotositeP first uploaded on August 11, 2010. It's sigotositeP's first original work with Kagamine Len as the main vocals. sigotositeP's previous work "Aqua" was technically her first work to feature the Kagamine Rin and Len (not as the main vocals, in Aqua, the Kagamines sang the chorus part whilst Meiko sing the main), however sigotositeP stated the song "Aqua" was just a "test" to try the Kagamines; and have stated they were somewhat difficult to begin with. Ten days later Fantasies of the Foam was uploaded.