Yoake Mae yori Ruriiro na centers on Princess Feena Fam Earthlight from the Kingdom of Sphere. It was decided that she was to live on Earth in a homestay with the family of the primary secretary to the president of the United Nations to get more knowledge on Earth to better prepare herself for her succession as the next queen. Long ago, humans landed on the moon and created a new home for themselves called the Kingdom of Sphere. However, a war called the Oedipus war broke out between the Kingdom and Earth. Once the war was over, it was decided that the city of Mitsurugasaki, where the story takes place, under the rule of the United Nations, be developed as the center of diplomacy with the Lunar Kingdom. This central lunar junction port city, which has the only spaceport within the United Nations with ships going to and coming from the Lunar Embassy. Although tensions have temporarily eased now, relations between the two worlds is still in a situation where caution must still be taken.