[Machine Translation] Marianne, a girl genius full of ideas, has just come up with ...... a letter is such a wonderful thing! Marianne, a genius daughter who loves books, uses her wealth of knowledge and powerful energy to help others on a daily basis. She manages a farm where orphans work, spreads the cultivation of buckwheat, which is resistant to sunlight, in her territory, and so on. Now she realizes the wonderful power of letters...! With the help of the second prince, who watches over Marianne, and her reliable sister, Catalina, she is becoming more and more active as a sun-drenched daughter!