Shū Hagiwara is the ex-boyfriend of Hina Tachibana despite him being already married during their relationship. Hagiwara also seems to have a good friendship between him and Kiriya Reiji. He makes his first appearance in chapter 8 despite him being mentioned earlier on.
Though Hagiwara does not make a color appearance in the manga, his hair appears to be a very light color, presumably white. He seems to have a very gentlemanly figure, proving him to be quite attractive, enough for Hina to fall in love with him. Hagiwara also wears glasses.