Intro. at the beginning of the 21st century, brothers in mind arrive on Earth, but their message baffles the best minds on the planet: "Let's play!" While authorities are looking for the hidden meaning of these words, and scientists are checking the accuracy of the decoding, 16-year-old Kyo Kakazu discovers a girl with cat ears and a tail in his bed. Eris turns out to be a messenger from the distant planet Kyatia, arriving for cultural exchange and establishing personal contacts. Kyo's house turns into an alien mission, and the guy himself, living without parents, turns into a reluctant diplomat. Eris soon begins to be pursued by secret organizations, intelligence agencies and governments, and Kyo decides to protect her, despite the dangers. Some anime characters: Kyo Kakazu is the main character whose name means "wonderful world". Eris is the messenger of the planet Kyatia. Aoi Futaba is Kyo's childhood friend. Manami Kinjo is a shy girl with glasses who Kyo felt was a kindred spirit.