Despite being the daughter of a viscount, Asako is rejected by high society and treated as a nuisance by her parents. When a marriage proposal suddenly arrives for Asako's younger sister from none other than Captain Kido, a soldier known for his coldness, she doesn't hesitate for a moment. To protect her precious younger sister, Asako volunteers as... a substitute bride!

As Asako visits the Kido family home for the first time, she finds herself amid a conflict that has been ongoing for over twenty years between father and son. Displeased with Shintaro's father's verbal abuse, Asako speaks up, further infuriating the man. However, Shintaro's reaction to his father's disrespectful treatment of his wife is completely unexpected...