User blog comment:B214/Volume 22 spoilers/@comment-201.215.165.7-20170213165134/@comment-24941352-20170215170913

Where in the LN was ever mentioned that Lilith was a former human? It is only was described in myths that she was the first wife of adam and if you think both this Light Novel and the myths are exactly the same, you should considered that Lucifer was originally a angel, so with other words Rizevim would be part fallen angel not a demon.