Grand Blue Dreaming Vol. 11 (Kodansha, 2020)

The diving club's excursion to an uninhabited island has left everyone in uncharted territory. While at first glance the island seems a heavenly oasis, it turns out to be a little less uninhabited than expected. Everyone is in for much more than they bargained for, and their dreamy excursion begins to feel more and more like a nightmare…