User blog comment:B214/Volume 23 discussion blog/@comment-2804:D41:4A9B:E500:1D4F:A397:BB70:B3C2-20170726041337/@comment-30924344-20170728001215

I just had a thought that the ceremony at the Ruins of Connection hosted by the Satans, was also for them to test to see if Issei would be the one who would represent the reincarnated devils for the Underworld in the future.