Born into a once-respected noble family, Miyo Saimori has lived her entire life as a servant in her own home. Following the death of her loving mother, her father remarried, and Miyo was stripped of her status in favor of her younger half-sister Kaya, who possesses the supernatural abilities Miyo lacks. Treated with cruelty by her stepmother Kanoko and stepsister Kaya, Miyo endures a childhood of neglect and abuse, believing she is worthless and has no future to hope for.

In a world that resembles Japan's Meiji or Taisho era but with a fictionalized history, certain bloodlines possess supernatural Gifts, such as pyrokinesis or the ability to see spirits. These abilities determine social standing and marriage prospects. When Miyo comes of age, her family arranges a marriage for her, not out of care, but as a convenient disposal. Her destination is the household of Kiyoka Kudo, a young and powerful military captain rumored to be so cold and cruel that every previous fiancée has fled within three days of meeting him. Expecting a life worse than the one she left, Miyo resigns herself to her fate.

Contrary to the terrifying rumors, Miyo finds Kiyoka to be reserved and stern, but not monstrous. He is initially suspicious of her, believing her to be another spy or gold-digger, and accuses her of trying to poison him when she prepares breakfast. However, Kiyoka quickly recognizes the genuine, kind, and deeply wounded nature beneath Miyo’s timid exterior. As they live together in his estate, cared for by the warm-hearted housekeeper Yurie, a slow and profound change begins in both of them. Kiyoka finds himself softening and becoming protective of Miyo, while Miyo, for the first time in her life, experiences kindness, respect, and the courage to believe she deserves happiness. Their cold, political arrangement blossoms into a tender and supportive romance.

The central narrative arc follows Miyo's journey of healing and self-discovery. As she grows more confident and determined to be of use to Kiyoka, she begins to awaken a powerful and rare ability known as the Dream-Sight Power, which had been sealed away by her late mother to protect her. This power draws the attention of powerful forces, including the Imperial Household and a mysterious organization known as the Gifted Communion. Miyo learns that her mother came from the Usuba family, a lineage of powerful dream-sight users, and that her own heritage is far more significant than the Saimori family ever knew. This revelation brings her into contact with her cousin Arata Tsuruki, who introduces her to her estranged grandfather and reveals the heavy responsibilities her sealed powers carry.

The narrative deepens in the second season, which focuses on the mystery surrounding Miyo's Usuba bloodline and the growing threat of the Gifted Communion, an organization that seeks to exploit powerful Gift users. As Kiyoka works to protect the nation from supernatural threats with his special unit, Miyo is drawn into a world of political intrigue and dangerous conspiracies. The season also explores Kiyoka’s complicated family history, particularly his stern mother Fuyu, and expands the role of supporting characters like Kiyoka’s sister Hazuki, who becomes a mentor and friend to Miyo. Together, Miyo and Kiyoka face external enemies and internal doubts, their bond tested by the very forces that seek to tear them apart, as they strive to build a future where they can finally find true and lasting happiness.