Kamishiro Rui is a knight belongs to the Black Knight and a magician who specializes in dark magic. Rui has bright yellow eyes, purple hair with two blue sides. He's half calm, half crazy. He likes platypus. He values ​​friends. He fights for what is important to him. He is very defensive, behaves gracefully. He used to be very lonely, so he will be very obsessed with person he loves. He would privately "dispose" of anyone who was a threat to himself and his friends, especially at night.