Five elementary school students are spending their summer vacation camping in a remote mountain village. While searching for their missing rabbit, Pyon-kichi, they discover an injured dog in a field marked by crop circles. After caring for the dog until he recovers, they are startled when he suddenly speaks, introducing himself as Pochi Rickman—an alien researcher who has been on Earth studying its plant life. In gratitude for saving his life, Pochi offers to take the children on a sightseeing trip to the moon. Upon arrival, the group quickly uncovers that the moon conceals a vast alien metropolis, which they begin to explore with delight. Unfortunately, after learning that Pochi was severely injured during his mission, the lunar government imposes a travel ban on Earth, preventing the children from returning home. With no other option, the group travels across the galaxy in search of a safe way back to Earth. During their adventure, they are pursued by aliens connected to "The Space Show," the universe's most-watched production, which remains shrouded in mystery.