Tachibana is Haine's blood related little brother. Upon seeing Haine, he mistakes her as their mother because they are alike in appearance. He is rude to her until he finds out Haine is his older sister. Later, he is very kind to Haine and has that "little boy" nature around her. Kusame was jealous of him because he spent much time and clung on to Haine. He is the soon to be "head" of the Kamiya family as the only male heir.