Last Waltz: Hakudaku Mamire no Natsu Gasshuku

This summer camp was supposed to be ordinary, but for Yuki, the manager of the baseball team, and her teammates, everything went wrong. They arrived on a private island for unusual training, but soon after their arrival, a civil war broke out there, and most of the men decided to leave the island to find out what had happened. Unfortunately, they never returned.

The girls soon found out that their ship had been destroyed. They found themselves alone on the island, faced with a shortage of food and water. The remaining guys were gradually losing control of themselves.