Humans landed on the moon long ago intending to create a new home for themselves called the Kingdom of Sphere. However, after a devastating war, relations between Earth and the Kingdom have worsened. The Lunar Kingdom closed its doors to Earth, with the exception of a single city. Princess Feena Fam Earthlight rents a room in the home of a diplomat in that city, hoping to learn more of Earth's culture and make peace between the Earth and the Moon.