Board Thread:Questions and Answers/@comment-44996737-20200206021937

I haven't finished the manga so I'm not sure if it states anything about this, but I've always been curious about this. What does it take to turn on Seraph mode? Are vampires able to do it? Out of Kimizuki, (Mirai is of course transformed but we're not exactly sure how since it looked quite different from transforming Yuu) Yoichi, Yuu, and Mika, we've only seen Yuu transform and stuff. What does Krul want from Mika's Seraph gene anyway? Does she want to use it somehow, or does she know that if Mika turns into a vampire he won't be able to transform? I'm just confused how all this Seraph transforming works  