User blog comment:B214/Volume 22 spoilers/@comment-201.215.165.7-20170213165134/@comment-30924344-20170215194221

@Helios Ishibumi mostly sticks close to the origin stories, so really Lucifer in this case is a being who became the first devil because fiction since ishibumi is sticking close to myths origin. We won't get any information on him at all so this just holds to be more likely.