Sister's∞MercY 〜ヴァンパイアとシスター〜 (Sister's∞MercY ~Vampire and Sister~)

Sister's∞MercY ~Vampire And Sister~ is a song sung by Rin Kagamine and Len Kagamine. Kazehiki Suuji and Gekiyaku Suuji have their own version of this song as well. It is the two-hundred-and-eighth track and the two-hundred-and-ninth track in Other Vocaloid Songs 125 and a Niconico only song.