A tiny mountain village in a remote woodland region becomes the setting for five primary‑school children who gather for a summer camp. Initially they revel in carefree days amid untouched nature, far from adult supervision. Their tranquil holiday turns dramatic when they find what they think is a small dog in distress. The creature, named Pochi, turns out not to be a dog but an alien on a crucial mission. A mysterious substance on Earth is coveted throughout the universe; Pochi had nearly discovered it but was badly injured in a fight and had to abandon his search. Thanks to the children's help...