This could have something to do with how the story ends - When MC completes all her worlds, the system asks - What do you want? So MC says - For Daddy to be happy, wherever he is, however he is. System - Are you sure? MC wants to meet Daddy again but she is adamant - Yes.
System goes and collects all the Daddies from each world. They wake up, realising their daughters are missing and go bat-shit crazy. System appears in front of them and true to their personality, try to attack it/ negotiate with it for their daughters. So system says - Your daughter wishes for your happiness. What will you do?
All the dads look at each other and like one tell the system - Go to her.
That's where the story ends.
(I use MTL so it's possible I might have gotten some things wrong) Or maybe, in the parallel world, Daddy sees her in a dream or something and decides to go and search for her.