Talk:Hikari Kirishima/@comment-169.227.254.124-20150527190940/@comment-25047329-20150527191330

Psssst! You might've wanted to have put this on the Kaneki page. :P

If you're watching the anime, they kind of, sort of explain it later, but not really. Without spoiling too much, the gist of it is, is that Kaneki had the organs of a ghoul transplanted into him, turning him into a half ghoul.