They woke up on the wrong side of the bed today and was a little late for the new chapter.
Author can take this opporunity to set up some delicious vanilla baits before kicking them dowm the NTR hill.
It is a pun on "無人" where the meaning was interepreted literally. "No man island" isnt No man island because it is unhibited, but rather there are literally no human beings living there.