Princess Exonia grew up in exoplanet.Her father is the king Exon and her mother died,because she was a human and humans can't life in exoplanet.King Exon choose 12 guaridans called EXO,who swear to protect her with their own lifes.There is just one Problem:Exonia hate to beeing a princess and want to life like normal humans in the humans world called the earth.For she is forbidden