Comment by Human on Childhood Friend of the Zenith - Chapter 36

@Human quite a bit the fourth one will appear a but late during an event called 'tournament of dragon and phoenix' that will be the final one for a long time than would come a LOT OF STORY around the heavenly demon and her being the 5th harem member but she is not one YET even in the novel which is still ongoing

@No one  
oh okay soo I can except 2 more of them appearing later on

@Human yup maybe the fourth one will make a small appearence if they rush but her appearence in near in the next arc

@No one   okay should be fun waiting a few months to see her

@Human yea also she was the only person he was ever romantically involved with in his past life plus she had a great impact on him as a whole and he had s** with her in his past life with her

@No one  
oh okay soo basicall