Sinopsis: Students from Yoshinomiya's municipal secondary school travelled on what they hoped would be an instructive excursion away from home with their friends, but it was not to be...

Unwelcome seas sunk your ship, leaving you stranded on a strange island!

The survivors are trying to figure out what occurred, but they quickly realize they aren't alone on the island, and the locations don't appear to be particularly hospitable to visitors!