Yae, the daughter of a long-established kimono shop, Sugikeiya, was promised by her parents when she was young to become the fiancée of Tsuyoshi, the eldest son of the prestigious Katsuragi family and an excellent military man. Yae was treated with respect despite the age difference between her and Yae, who kept her young love in his heart. Yae, who has feelings for Tsuyoshi, is striving to become a woman worthy of him, as her heart swells with expectations that the red thread of her destiny is connected to Tsuyoshi. However, one night, Yae encounters a fire and is shocked by the burns on her body. Yae says that since she has become a defective woman, she is no longer qualified to marry her, and that she wants to break off her engagement to Tsuyoshi, but... True love, whose purity is scattered by her sweetness, and the red thread burnt by the cruel flames is spun again.

Marone became a knight to repay a debt of gratitude to Princess Safinia, who rescued her when she was a child. When he asks her to be his personal guard, she casually refuses, as she has been living as a "Hidden Princess" since she lost her mother and twin brother at the same time. But he is still followed by her like a loyal dog, and perhaps because of this, his attitude softens little by little. The first time you see her, you'll know that she's a very attractive woman...