Kazuyuki Izumi (泉一之, lit. Izumi Kazuyuki) is the husband of Nobuko Izumi and the father of Shinichi Izumi. He is a former magazine writer, now freelance. Kazuyuki is a tall middle-aged man with a mustache and black hair that he keeps combed. He's normally seen wearing a brown button up vest over a green long sleeved shirt and blue jeans. He also resembles his son whom the latter inherited his facial appearance from. In the beginning, Kazuyuki is a rather laid-back person, seeming to go with…