Within him, another will has taken root. Dr. Henry Jekyll, a man of science— and Edward Hyde, the shadow born from his innermost self. London, at the close of the 19th century. A single formula, conceived between science and superstition, begins to erode the boundaries of humanity. Then comes Jack— a youth who dismembers his victims beneath the cover of night. A chance encounter with this aberration sets three lives on a path that slowly, yet inevitably, begins to warp. This is a tale that asks a question of our very nature: How far can a man fall before he ceases to be human? A historical dark fantasy set in fin-de-siècle London— a story of psychology, relationships, and the descent into madness. ※ 実験中 (Experimental) Original Japanese Title: サグリス・ドランク　-エドワード・ハイドの逆鱗-