Lucia is the captain of the imperial knights and a swordmaster famous for her extraordinary achievements. However, she regrets something on her deathbed: unknowingly aiding a nefarious group in their plot to sacrifice the saintess for profit. So when she wakes up in the past as her 25-year-old self, Lucia is determined to rescue the child saintess and keep her safe until she's old enough to protect herself. But the formidable knight is completely clueless when it comes to raising a child... Will six months of maternity leave be enough time for her to figure things out?