秘蜜〜黒の誓い〜 (Himitsu ~Kuro no Chikai~)



Alluring Secret (Black Vow) is a song sung by Rin Kagamine and Len Kagamine. It is the one-hundred-and-sixty-fourth track in Other Vocaloid Songs 12: Mostly Rin Volume 2 and the one-hundred-and-fifty-fifth track in Other Vocaloid Songs 26: Mostly Len Volume 2.