"Chikyū SOS Soreike Kororin" is a science fiction anime series that revolves around the adventures of a group of children who band together to save Earth from an impending alien threat. The story begins when a mysterious alien named Kororin crash-lands on Earth, seeking refuge from the malevolent Zorori Empire, which has been pursuing her across the galaxy. Kororin possesses a powerful device called the "Earth SOS," which has the ability to protect planets from destruction. However, the Zorori Empire aims to seize this device to further their conquest of the universe.

The narrative centers on a group of elementary school children who encounter Kororin and take it upon themselves to help her. The main characters include Tetsuo, a brave and resourceful boy; Yumi, a kind-hearted and intelligent girl; and their friends, who each contribute unique skills to the mission. Together, they form a close-knit team determined to safeguard Kororin and prevent the Zorori Empire from obtaining the Earth SOS.

As the story progresses, the children face numerous challenges, including battles with the Zorori Empire's robotic forces and the need to solve puzzles and overcome obstacles to activate the Earth SOS. The series balances action-packed sequences with moments of camaraderie and lighthearted humor, highlighting the children's growth and determination. Kororin, despite being an alien, forms a deep bond with the group, and her presence serves as a catalyst for their courage and unity.

The plot unfolds across various locations, from their small town to outer space, as the children work to outsmart the Zorori Empire and protect Earth. The series emphasizes themes of friendship, teamwork, and the importance of standing up against adversity. By the end, the children's efforts culminate in a climactic showdown with the Zorori Empire, where they must use their ingenuity and the power of the Earth SOS to secure a hopeful future for their planet.