Lady Magdalia, born Mutou Sayo, is Amakusa Shougo's younger sister. She functions as a spiritual mother figure to their religious community and teaches the children, despite having battled consumption since childhood—an illness she likely inherited from her own mother. She's rarely seen without Shozo, a childhood friend whom she and Shougo once protected from persecution.
A committed Christian, Magdalia believes in everything her brother stands for, which puts her at odds with Sagara Sanosuke's more pragmatic worldview. Her most treasured possession is her mother's holy medallion. When she loses it, Sanosuke eventually returns it to her, marking a turning point in their relationship. Though they start as ideological opposites, she comes to respect him deeply and regrets not meeting someone like him sooner—someone who might've opened her heart beyond the boundaries of her faith.
Her final act defines her character: shot while shielding the Dutch consul (a man capable of saving her town's people), she refuses treatment, hoping her sacrifice will secure their safety. She dies in Sanosuke's arms after revealing her real name to him. Before the end, Shougo vows to transform her dream of a peaceful, equal world into reality.
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