Sougetsu no Kyuuketsuki Vanitas

Born beneath the ominous blue moon, she was cast out and rejected by her fellow vampires as a heretic. As the one who crafted the grimoire 'The Book of Vanitas,' she rescued two human boys—Vanitas and Mikhail—from a laboratory, taking on the role of mentor and a mother-like guardian to them both. Her very existence remains veiled in enigma, placing her at the heart of the connection between past truths and the protagonist's destiny.