Board Thread:Questions and Answers/@comment-36009152-20200106111246/@comment-44056425-20200217143957

According to Catastrophe at 16 novel 3 final chapter on Mahiru's notebook that was directly mentioned that those children whom were experimenting on by Hyskuys sect in order to turn to a seraph, before the process they were forcefully had MIXED UP with a DEMON and at the end of novel 6 I think that Guren went to Hyakuya sect which was destroyed by vampires and there he found Mika's notebook that he was writing on it about his relationship with Yuu and others like Kimizuki and so it means that Hyakuya sect had did the human experiments on him as well too and had forcefully MIXED HIM UP with a DEMON too which means that Mika already has a demon in his self too