Gosick

The Toppled Maria has a Fly's Head (1x16)

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Victorique's father has her taken from the academy to a convent known as "Beelzebub's Skull" in Lithuania. Kujo learns about her whereabouts from Grevil and takes a train going there to look for her. Guided by a woman who resembles a lot like her, Kujo manages to find where Victorique is held and learns from her that the woman is most likely her mother, Cordelia.