When Homare's father explains to her that school life is just as much a fight for survival as being a castaway, Homare pushes past her anxiety to begin a new path in life!! Mutsu makes her long-awaited debut as an author when she publishes an account of their time on the island! Even as Asuka and Shion celebrate as well, something seems off... Plus, things that they never mentioned happening on the island will be revealed?! The conclusion to this high school girl survival story!