Shironuma is the 2nd Main Character and the Main Seme. He is ten times more quite and aloof than Youji, yet very sweet and caring and becomes Sakiyama's knight/prince. He is the one who really understands and cares for Sakiyama the most, making him the perfect person for Sakiyama. He's always there for Sakiyama to help him, save him and love him.
Sakiyama and him have similar childhoods. He lives with his step-parents.