User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-3325617-20140704194328/@comment-3325617-20140705063040

Yeah that would be the compatable theory for 666 since It's DXD ,but I just remembered cuz 777 is the number of luck and apperantly 666 is the number of a legendqry beast that's why I said if Ishubimi took it from thay theory.Anyway It would be pretty cool that 666 came from nightmares .Thank you for replying to me :)