This story continues from "The Powerful Territory Reform of a Super Genius Inventor Noble Lady" (formerly titled "My Sister is Usually the Hated One"). Marianne, once called a genius girl, is now a Duchess, happily living with her husband, Alexandre, and their three children. Even as an adult, her genius remains, and her inventions play a crucial role in wartime, earning her the title of "Genius of Salvation." Life with Alexandre and her children is heartwarming yet suspenseful—far from the life of a graceful Duchess. Marianne tackles daily incidents, genius-level worries, and parenting concerns while pursuing her path of genius. Alexandre, a late bloomer, becomes increasingly more of a loving husband, excelling as both a Duke and a Prince. Their three children are: Harold (the eldest son, a righteous and serious boy, the future king due to the lack of heirs in the royal family, age six), Nicholas (nickname Nico, resembles his mother in appearance and personality, showing signs of genius, age three), and Flora (the youngest daughter, six months old, resembles her father, destined to be a beauty). This story depicts the heartwarming and suspenseful daily life of the Marianne family. This novel is a sequel to "My Sister is Usually the Hated One, But Life's Too Short Not to Enjoy It!" (https://ncode.syosetu.com/n0807gn/ N code N0807GN), but can be enjoyed as a standalone.