Tsukasa took his job very seriously. He believed to always be professional, so he calls Rui by his last name, Kamishiro. Rui annoys Tsukasa with every little unprofessional thing he does. Tsukasa has two younger sibling he's been taking care of forever. Saki and Toya. Toya, his younger brother by two years, Saki his younger sister by three. He's a detective to live out his father's legacy. Tsukasa is the best detective in the strict company. Tsukasa dies, Rui dies. Searching for phantom assassin