"Project Blue Earth SOS" is a six-episode anime series that blends science fiction, mystery, and adventure. Set in the 1950s, the story revolves around a young boy named Billy Kimura, who becomes entangled in a global conspiracy involving extraterrestrial threats and advanced technology. Billy's life takes a dramatic turn when he encounters a mysterious girl named Penny Carter, who possesses a unique connection to an alien artifact known as the "Blue Earth." This artifact is a powerful device capable of controlling gravity, and its existence draws the attention of both human factions and alien forces.

The narrative unfolds as Billy and Penny are pursued by the enigmatic organization known as the "Black Ghost," which seeks to harness the Blue Earth's power for its own agenda. Alongside them is Dr. Kato, a scientist who becomes a mentor figure, providing guidance and technological expertise. The trio navigates a series of escalating conflicts, uncovering the true nature of the Blue Earth and its origins. The story delves into themes of trust, sacrifice, and the consequences of wielding immense power, as the characters grapple with their roles in a larger cosmic struggle.

The series is structured around episodic encounters with various antagonists, including alien invaders and human conspirators, each contributing to the overarching mystery. The pacing is brisk, with each episode advancing the plot while revealing new layers of the central conflict. The characters' development is tied to their interactions with the Blue Earth and their growing understanding of its significance. By the conclusion, the story reaches a climactic resolution that ties together the threads of the narrative, leaving a lasting impact on the characters and the world they inhabit.