God Child (Godchild) - Yuki, Kaori

Deep in the heart of 19th century London, a young nobleman named Cain walks the shadowy cobblestone streets of the aristocratic society into which he was born. Forced to become an earl upon the untimely death of his father, Cain assumes the role of head of the Hargreaves, a noble family with a dark past. With Riff, his faithful manservant, and Mary Weather, his 10-year-old half sister, Cain investigates the mysterious crimes that seem to follow him wherever he goes.

(Source: VIZ Media)
Included one-shot:
Volume 5: Nichiyoubi no Solomon Grundy

God Child was published in English by VIZ Media under the Shojo Beat imprint from March 7, 2006 to February 5, 2008.