第 15 集: 三人組探索東部森林，而信吾在通訊方面陷入困境

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As Luna, Bell and Howard head deeper into the Eastern Forest, Shingo works on the communication system back at the house, but is frustrated that he doesn't have enough parts. Shingo and Chako return to the shuttle for more parts, but Shingo gets angry at Chako's dismissive attitude. Later, he tries to operate the communications device using Chako as a power supply, but is unsuccessful. Meanwhile, as Luna, Bell and Howard get deeper into the forest, Luna starts to hear the voice more often. They also find they can jump much higher than usual. Eventually, they encounter some sort of overgrown ruin. Luna's head starts hurting and she suddenly sees an image of an alien family. As the trio approaches the ruin, a giant crustacean suddenly emerges from the water surrounding it. It chases Howard, but gets crushed under a boulder. Howard grabs a piece of one leg as a trophy, but a second crustacean attacks. They flee back to the cliff they climbed down. Pague, who had come to visit the house, suddenly becomes agitated and runs away, followed by Kaoru and Menori. They reach the cliff above the Eastern Forest just in time to pull Luna, Bell and Howard out of reach of the crustacean. That evening, they discuss their findings. Howard presents his trophy, but throws it away in disgust when slime comes out of it. Chako discovers a strange machine in the slime. (Source: Wikipedia)