User blog comment:B214/Question and Answers 2/@comment-4547267-20140522190033/@comment-24098614-20140522221838

I can tell you this put all your bets on the Harem ending because it is either a Harem ending or bust in this series nothing short of this will appease the fans because you can't displease the fans, and start getting flames or hate mails to the Author.

The biggest mistake that this Author would make if he suddenly destroys all his relationships, and makes Issei keep one girl like Rias because I remember this was done on a very popular Manga that involved Harems, and I won't mentioned the title but it left many fans angry and displeased.