Talk:Touka Kirishima/@comment-71.75.140.177-20170621192312/@comment-10733658-20170621201232

That's already been discussed several times below. We use it in cases of a significant relationship where in the couple is not married, but otherwise serve as a major relation to the other. We've previously used it for Nishiki and Kimi, or Yoshimura and Ukina. Touka and Kaneki seem to have reached a similar point, of basically being a family while not having any sort of paperwork to go with it.