The members of the JUDA task force have come to a tropical island as a company outing. Thanks to the good-natured whim of Kunio Ishigami, Risako and Domyouji have also been invited to join them. Kouichi finds himself in an uncomfortable position as Domyouji asks him which is his true love interest, whether it is Risako or Kizaki. Their brief vacation is interrupted as the members go missing one by one by a mysterious creature with tentacles.