"Babuba, babubabubabubabu!?" (Have I become a baby!?) Toth, an assassin legendary in the underworld, was sold by her parents at a young age and raised strictly as an assassin, never knowing the love of family. On a whim, she dies saving a cat, but after her death she is nearly sent to hell for taking so many lives. However, due to her single good deed of saving the cat, she is allowed to reincarnate and is reborn as Patricia, the princess of the kingdom. God then commands her to save the royal family - her family. She was supposed to be reborn as a powerless baby, but her assassin skills have not diminished, and she repels assassins one after the other. Gradually, she begins to feel a desire to protect the royal family, who love her unconditionally simply because they are family - and...