Kiyoshi Yokokawa

"Daddy...
 * Seita to the photo of his father"

Kiyoshi Yokokawa is the father of Seita and Setsuko, and the husband of Mrs. Yokokawa. He was supposedly in the navy during World War II. Seita and his sister attempt to write to him several times during the film, but never receive a reply. Much later, Seita overhears while at the bank that the Japanese have lost the war, and that the entire fleet of ships has been sunk. Astonished, Seita finally realizes why his father hasn't written.