《 Reunion ; LesliexIsabella 》

" I-Isabella -!? "
" Leslie..?! "
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The day of Leslie's adoption. The day he gets shipped out. The day he learns the truth about this horrible place that is said to be an orphanage..
everything has been a lie, the whole time, every second..

As finding out the truth, will this be the boys last breath?
Or......
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Years have passed. Still, the now new mother of the Gracefield orphanage couldn't forget the days she shared with her friend, keeping and treasuring the gorgeous lullaby he had created.
"My dear children, a guest will arrive tomorrow and stay for around a month, let's welcome him dearly when he arrives." Isabella spoke to the children at the dinner table, smiling softly as they all smiled and agreed.

..who will this guest be?
and why is he even visiting this place?
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DISCLAIMER
!! I do not own the promised neverland or any of the characters !!
!! This story will have Anime spoilers !!
I haven't read the manga yet (only got some spoilers) so this will maybe have one or two manga spoilers but not much (and pls don't spoiler me more thx)
English also isn't my first language so i apologize for any mistakes!