A re-telling of the story of the vocaloid song 秘蜜〜黒の誓い〜 (Himitsu Kuro no Chikai ) or Alluring Secret Black Vow, put into words. Original story credit is to producer Hitoshizuku-P. This story was just my own imagination based on the original song. AN: I started this piece almost 10 years ago, and now just re-discovered it, and decided to publish with a bit of tweaking and editing