Kuroyagi ~Otome-tachi e Sasageru Serenade~

In the late 19th century, a noble family in Western Europe—the Yagi clan—reigned from their stately manor. But one day, the Earl vanished without a trace, and all members were found dead, the crime unsolved. A century later, a detective took on the case without prompt, only to disappear himself. His best friend, an ordinary journalist with a hidden ancestry—a witch in his bloodline—steps into the mansion to uncover the truth.