Christina is the thirteenth princess of the dwindling Estgloria Kingdom. The ruling Queen of Estgloria has sent Christina to Shina Dark out of hate for Christina's mother. Christina receives the title of Blue Moon Princess, the second of the Twin Moon Princesses. While not strong or possessing any real power, Christina proves to be a skilled strategist, however, she has trouble seeing that herself and often feels useless. Christina also suffers health problems after being slowly poisoned over many years under the orders of the Queen. Touched by Exoda's (Satan) kind and caring words, she also develops affection towards him. She regards Galett as a friend as well as a rival towards love.