"Chōjikū Robo Meguru" is a science fiction anime series that centers around a young boy named Meguru and his encounters with a mysterious robot from another dimension. The story begins when Meguru, an ordinary elementary school student, discovers a small, sentient robot named Gain in his backyard. Gain is revealed to be a "Chōjikū Robo," a robot capable of traveling across dimensions and time. Gain's arrival is tied to a larger conflict involving interdimensional beings known as the "Dimension Beasts," which threaten the stability of multiple worlds.

As Meguru and Gain form a bond, they are joined by other characters, including Meguru's classmates and a girl named Mii, who has her own connection to the interdimensional events. Together, they work to protect their world from the Dimension Beasts, which are drawn to Earth due to its unique energy. The series explores themes of friendship, courage, and the consequences of tampering with time and space.

The narrative unfolds through episodic adventures, with each episode introducing new challenges and enemies. Meguru and his friends must learn to harness the power of Gain and other Chōjikū Robos to combat the growing threat. The series also delves into the origins of the Dimension Beasts and the reasons behind their invasion, revealing a deeper, interconnected history between the dimensions.

Key characters include Meguru, who serves as the emotional core of the story, and Gain, whose evolving relationship with Meguru drives much of the narrative. Mii provides a mysterious and resourceful counterpart, while other supporting characters add depth to the group dynamic. The series balances action-packed battles with moments of character development, emphasizing the importance of teamwork and trust in overcoming seemingly insurmountable odds.

"Chōjikū Robo Meguru" combines elements of mecha, adventure, and science fiction, creating a story that appeals to a younger audience while incorporating enough complexity to engage older viewers. The series concludes with a resolution to the immediate threat of the Dimension Beasts, while leaving room for further exploration of the multiverse and its mysteries.