“I can’t sleep without you.” Amarion Amari, a poor count maiden who wields a sword every day in the barren North. One day, she received a proposal from the great nobleman of the Empire, Archduke Morte, who is also known as ‘Walking Death’. “Be my wife, and I will give you everything.” She had to accept this irresistible offer, and on their first night, the Archduke made a request of her. ​ “Stay by my side all night, but you must stay awake.” When the Archduke went to bed after handing a sword to her, Amarion realized why this beautiful and fearsome man had to marry her, a knight.​ “You are like a miracle to me.”​ The nights went on, the more the duke fell in love with her; and Amarion gradually opened her heart to his sweetness… The action-growing romance between the two begins now.