Last Waltz - Episode 1

It was supposed to be a simple summer camp. Yuki is the manager of the baseball club. She and the other members stay at a training camp on an isolated island. Suddenly, a civil war breaks out. The male teachers leave the island to find out what is going on. However, they do not return. A few days later, they learn that their ship has been destroyed. While having nothing to drink and nothing to eat, they start to gradually lose their self-control...