[ Hentai Sex Manga ] Last Waltz 01

It was meant to be just a summer training session.... Yuki is the baseball club's caretaker. She and the other members are now stationed at a training camp on the remote island. However, a civil war breaks out one day. Male teachers depart the island to investigate the situation. They never return, though. They discover their ship has sunk several days later. There's nothing to drink or eat.... They progressively lose their ability to control themselves....