As Amarion, a knight of the barren Northern Kingdom, battles monsters daily, she suddenly receives a marriage proposal from Grand Duke Mort, known as the 'Walking Death'. Due to the immense dowry that could sustain her Northern Kingdom, she accepts the proposal. On their first night, she faces an unbelievable offer. “You have but one task: to be by my side when I sleep. However, you must remain awake. If you find it unbearable, you may strike me down. I will not resent you.” After he utters these enigmatic words and falls asleep, Amarion realizes why the Grand Duke had to seek out a knight like her to be his wife. As the sleepless nights, filled with tension, continue, the Grand Duke’s demeanor gradually softens, becoming sweeter. Finally, Death calls out to her, smiling enchantingly. “My wife, will you allow me to call your name?”