Chitose Kaginoji, an adopted relative of Tsukasa Yuzaki, views her as a sister after Tsukasa rescued her from a near-fatal cliff fall in childhood. This act forged an unwavering loyalty, compelling Chitose to devote herself to Tsukasa’s protection as lifelong repayment. Though initially supportive of Nasa Yuzaki’s admiration for Tsukasa, she fiercely opposed their marriage, consumed by jealousy and a yearning to monopolize Tsukasa’s affection. Collaborating with her maids, Aurora and Charlotte, Chitose schemed to sabotage the couple—discrediting Nasa, undermining his trustworthiness, and even orchestrating his kidnapping. Yet her resolve wavered as she acknowledged Nasa’s inherent kindness and Tsukasa’s genuine happiness, leading to conflicted remorse. Gradually, she relinquished her possessiveness, choosing to honor Tsukasa’s joy by accepting the marriage. Chitose’s familial tie to Tsukasa stems from their shared grand aunt, Tokiko Tsukuyomi, though the specifics of their adoption or blood relation remain unclear. Her temperament blends fiery determination with petulant theatrics, often erupting into exaggerated comedic outbursts during clashes with Nasa. Initially an antagonist, her arc pivots on reconciling her obsessive devotion with Tsukasa’s autonomy. Despite lingering reluctance, she ultimately embraces a role as the couple’s grudging ally, silently prioritizing Tsukasa’s fulfillment over her own desires.