Cain's companion and the self-proclaimed fiancé of Mary Weather, Oscar hails from an aristocratic lineage. Disowned by his father, he aims to regain his father's approval by marrying Earl Hargreaves's sister. His numerous futile endeavors to capture Mary's affection frequently inject humor into the manga.

gabriel oscar
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Disraeli Jizabel
Main
Alexis illegitimate son and Cains half-brother. Jizabel is a sadistic doctor who works for Alexiss secret organization Delilah. As a child, he cared for the lives of animals, but was tricked into eating his pet sheep by Alexis. Alexis also murdered his ol...
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Hargreaves Cain C.
Main
Cain is a young English nobleman who is also known as the Earl/Count of Poison for his fondness in collecting and storing different kinds of poisons which he calls his "children". Cains childhood was filled with both physical and mental abuse inflicted by...
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Hargreaves Mary Weather
Main
Cain's ten-year-old half sister. After her mother commits suicide to protect her from her obsessive suitor, Mary lives on the streets of London as a fortuneteller. Cain believes that she is his half-sister, and adopts her. Outgoing and strong-willed, she ...
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Raffit Riffael
Main
Cain's valet. Riff dresses Cain and ties his shoes for him, which Yuki considers "a form of communication between the two of them because they've been together so long that they're almost like father and child." Secretly a high-ranking member of Delilah, ...
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Cassian
Supporting
Cassian is one of the lower members of Delilah. As a child, he was given to a circus by his parents. In the organization, Cassian works for Jizabel. Despite not liking the man at first, he grows to care for him over time.His weapons of choice are throwing...
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Crehador Dominic
Supporting
A medium who can talk to the dead who first appears in the Butterfly Bones (Butterfly's Remains) arc. Clehadol comes from an old French aristocratic family that has declined.He initially appears to be working for Alexis, who offers the medium the position...
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Gabriel Oscar
Supporting
Cain's friend and Mary Weather's "self-claimed" fianc. Although he is from an aristocratic family, Oscar is disowned by his father and therefore tries to win back his father's attention by marrying Earl Hargreaves's sister. Oscar often provides hu...
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Hargreaves Augusta
Supporting
Cain's aunt and real mother. After giving birth to Cain, she became insane and later jumped out of the window of her institution when Cain visited her for the second time, mistaking him for Alexis. As she lay dying, she apologized to Cain and warned him t...
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Hargreaves Alexis
Supporting
Cain and Jizabel's father. Abusive, and a skillful manipulator Alexis blames Cain for Augusta's insanity and death, and resolves to make life impossible for him. As the leader of Delilah, he assigns members within the secret organization their ranks. The ...








