"Denkō Chō Tokkyū Hikarian - Lightning Attack Express" is a children's anime series that combines elements of action, adventure, and science fiction. The story is set in a futuristic world where advanced trains, known as Hikarian, are sentient beings that protect the planet from various threats. These trains are operated by a group of young heroes who form the Hikarian Corps, tasked with defending Earth from the malevolent forces of the Dark Axis, an organization seeking to conquer the universe.

The narrative revolves around the Hikarian Corps as they pilot their specialized trains, each equipped with unique abilities and weapons, to combat the Dark Axis. The main characters include Raikou, the leader of the Hikarian Corps, who pilots the Shiden, a high-speed train capable of lightning-fast attacks. Other key members include Hayate, the pilot of the Hayabusa, known for its agility, and Kakeru, who operates the Raijin, a train with powerful defensive capabilities. Together, they work to thwart the Dark Axis's plans, which often involve deploying giant robotic monsters and other destructive machines.

The series is structured around episodic battles, with each episode featuring a new threat from the Dark Axis and the Hikarian Corps devising strategies to overcome it. The trains themselves play a central role, often transforming or combining to unleash powerful attacks. The storyline emphasizes themes of teamwork, courage, and the importance of protecting the planet, with the young heroes learning and growing through their experiences.

As the series progresses, the Hikarian Corps faces increasingly formidable adversaries, leading to larger-scale conflicts and deeper exploration of the characters' backgrounds and motivations. The Dark Axis, led by the enigmatic Emperor Z, is portrayed as a relentless force, constantly evolving its tactics and technology to challenge the Hikarian Corps. The interplay between the heroes and their adversaries drives the narrative forward, culminating in a climactic showdown that tests the limits of their abilities and resolve.

"Denkō Chō Tokkyū Hikarian - Lightning Attack Express" is characterized by its straightforward, action-oriented plot, designed to engage a younger audience while incorporating elements of science fiction and mecha genres. The series maintains a clear focus on the conflict between the Hikarian Corps and the Dark Axis, with each episode contributing to the overarching storyline of defending Earth from extraterrestrial threats.