Lucia, the commander of the Imperial Black Knights and the youngest Sword Master on the continent. Her infamous title? "The Black Monster." After 40 years of seclusion, at the age of 92, just before taking her last breath— Lucia regresses to when she was 25. Haunted by the mistakes of her past life: The tragic death of a young saintess, The so-called "sacrifice" carried out in the name of the temple’s seal... And the painful truth—she was the one who delivered the saintess to the temple. Now given a second chance, Lucia is determined not to repeat her past mistakes. This time, she makes a decision: She will become the saintess’s mother. "Your Majesty, I must take maternity leave."