天使だと思っていたのに (Tenshi da to Omotteita no ni)

Background
Hatsune Miku seems to be alive. "I thought I was an angel" is an original song by Utsu-P featuring Hatsune Miku. It is the theme song for the smartphone game #Compass. It also has entered the Hall of Fame, and surpassed 500K views on YouTube. It is his most popular song.