Black Butler: Book of Murder

A storm‑bound murder party forces aristocrats and demons alike to hunt a hidden killer.

When Queen Victoria summons the Phantomhive estate for an opulent soirée, Earl Ciel finds his guest list brimming with aristocrats, artists, and a down‑on‑his‑luck novelist named Arthur. The night sparkles with fine wine and polished conversation, but a sudden thunderstorm traps everyone inside the manor, and the celebration takes a dark turn when a prominent guest is found dead. All eyes fall on Ciel, whose reputation for flawless conduct makes the accusation all the more shocking. As the storm howls, the mansion becomes a pressure cooker of suspicion. Sebastian, the ever‑impeccable butler with a hidden, demonic edge, must navigate a maze of clues while protecting his master from both the unseen killer and the law. Each subsequent murder raises the stakes, forcing the elite and the servants to set aside their class differences and work together. The OVA blends Victorian elegance with supernatural intrigue, delivering a tightly paced whodunit where every creaking floorboard and whispered secret could be the key to unmasking the murderer before the night ends in blood.

A Victorian murder-mystery OVA where guests at a manor are killed one by one in graphic ways while a demon butler and his child master investigate. Expect bloody corpses, sustained peril, and a dark, suspenseful tone more intense than the main series.