Feena is the princess of the Kingdom of Sphere on the moon. In order to become more knowledgeable about Earth and be able to follow in her mother's footsteps, she comes to Earth in a homestay with the family of the primary secretary to the president of the United Nations, Sayaka Hozumi. Since she was very young, she has always wanted to know more about the Earth and some day she hopes to surpass her mother in trying to bridge the gap between the Earth and the Kingdom of Sphere. She is well educated in terms of literature and science and has great sword skills. However, she is somewhat naive in matters of the heart and has a tendency to jump into situations without thinking, (such as jumping into a river to save a drowning puppy, without knowing how to swim, and mistaking moths for aliens).