Just finished watching the series (have not watched the movie that comes before it) but I have a spoiler question so here comes the small font
Is nathan maler the chevalier of Saya's mother? He never showed any real attatchment to Diva or Saya. Also Saya's blood didn't kill him.
Honestly just seemed more interested in letting the fates of the girls play out than killing Saya or intently protecting Diva.