Catherine is a Vampire of the Crimson Moon from Jun Mochizuki'sThe Case Study of Vanitas. Catherine belongs to an unknown aristocratic family within the Vampire world and, as such, she received an invitation to Marquis Machina's Bal Masque alongside her mother and younger sister. Here, she encountered Vanitas, who she would later learn is a human doctor intent on saving Vampires from Vanitas of the Blue Moon's curse in order to enact his revenge against the Blue Moon Vampire. Catherine would later fall prey to Charlatan in an attack against the Curse-Bearers at the Bal Masque, having secretly been a Curse-Bearer herself. She was later killed by Vanitas because she's too far gone to be restored.