He is the 26-year-old subordinate of the Senagaki Yakuza Family, who serves as a guardian for looking after the Boss's granddaughter, Isaku Senagaki. Because of his promise to protect the latter at all costs, he went as far as to lying about his actual age, in order to attend the same school as her. Keiya is noted to be very handsome, stands tall in terms of height. He has soft black hair with a dark undercut, three piercings, a light complexion,pronounced lips and sharp but calm blue eyes.