世界の淵で二人だけの舞踏会 (Sekai no Fuchi de Futari Dake no Butoukai)

Sekai No Fuchi De Futari Dake No Butoukai is a song sung by Miku Hatsune. Megane Meggi and Ritsu Namine Kire have their own version of this song as well. It is a deleted song.