[DeepL Translation - needs review] Introduction to Volume 1: During summer vacation, 15 boys and girls come to a depopulated village for "nature school." One week later, they go exploring in a cave by the sea and meet a mysterious man named Kokopelli, who lives in the back of the cave with a computer. He invites them to play a game he has created, and the 14 first-year junior high school students, except Kana Ushiro, agree and sign a contract. They return to their lodgings half-convinced, bu...
