The (real) Emperor. He is revered by mostly everyone at Imperial Academy, and it certainly helps that his family is very rich and famous. Shizumasa developed a love for Haine. He is sometimes cruel, but he's a real gentleman to Haine, because of his love for her.
Due to his illness, however, his twin brother, Takanari, is currently posing as him. A slight difference between Takanari and Shizumasa is that Shizumasa's hair is more visibly lighter than his older twin brother. His illness a is a type of cancer called leukemia.