She is Madoka's classmate in Graphic Design and friend. She is also Shirou's sex partner and high school friend. During her high school, it is revealed that her both parents cheated each other, resulting Rie to be sexually attached with Shirou and destroys happiness of other people. After she found out the peep hole from Shirou, she manipulated Yoneyama in her plans to eradicate the relationship between Emiru and Tatsuhiko.
The protagonist, a 15-year-old girl who takes the name of her murdered twin bother Tatara, who was known as the child of fate. As Tatara, she wields the sword of Byakko and leads the survivors of Byakko Village. Even among her allies few people know she is a girl. Sarasa hopes to create a land that is fertile, full of flora, and free of strife. Though she is quick to cry and psychologically weak in some respects, over the course of the story she develops undeniable skills in leadership and swordplay, and becomes the central figure of the Tatara Army. Because of visiting hot springs she has met a curious young man named Shuri, who has become her only outlet for being completely herself as Sarasa. But at the moment she does not know that Shuri is her hated enemy The Red King.
The youngest son of the Emperor, he rules over Saikoku (western Japan) which includes Chugoku, Shikoku and Kyūshū. Though he is merciless to his enemies, Shuri is a capable ruler and very proud of his realm. He has a big-hearted, free-spirited personality and is generally quite personable, though he tends to be overly competitive. Shuri is an expert swordsman. In the early parts of the story Shuri stands out as brutally cruel to those who do not obey him, because he is responsible for the destruction of Byakko Village and the murder of Tatara. Later he meets Sarasa, unaware that they are enemies, and falls in love with her.