"E? Aa, Sou." is an original song by Chouchou-P featuring Hatsune Miku. Famous for utilizing Miku's lower octave vocals as well as spawning numerous high-quality fandubs and parodies, this speedy piano light rock song portrays Miku as a somewhat older, reckless and nymphomaniac "Carnivorous Girl" who exploits masculine lust to her own advantage. It has reached the Hall of Legend, and is one of Chouchou-P's most notable songs.