The school takes the students on a mountain trek. But Shin-chan, Masao, Suzuki and Kazama get lost during the trek. Shin-chan and his friends take shelter in a cave for the night. Yoshinaga gets worried about the kids but Matsuzaka calms her down. In the morning, the kids try to find a way out. They eat mushrooms to calm their hunger and use fire to help the teachers find their location. (thetvdb.com)