Tamayo Shima

Tamayo Shima presents herself as the poised and distinguished eldest daughter of the Shima household, yet beneath that refined appearance lies a heart of calculated cruelty and relentless ambition. As the story's primary antagonist, she will stop at nothing to monopolize both the family's power and her father's favor—going so far as to poison her own eldest brother and systematically threatening and marginalizing her other siblings, including the protagonist Tamahiko. Treating family bonds as mere instruments to be exploited, her ruthless methods make her the driving force behind every conflict within the family.