User blog comment:B214/New anime 2017 discussion blog/@comment-97.86.117.132-20161230234256/@comment-1359322-20161231145955

Come to think of it, how come Kurenai the person who help created Airi and Ex's Artificial Longinus doesn't have one of his own? Kurenai did say he was the one who succeeded Azazel's research. Or maybe Kurenai hid his SG from his siblings.