"Ninja Robots" is a science fiction anime series that blends elements of mecha action with traditional ninja themes. The story is set in a futuristic world where advanced technology coexists with ancient ninja clans. The central conflict revolves around the struggle between the benevolent Kōga ninja clan and the malevolent Iga ninja clan, both of whom possess powerful robotic suits known as Ninja Robots. These mechas are equipped with advanced weaponry and stealth capabilities, making them formidable tools in battle.

The protagonist, Sasuke, is a young and skilled ninja from the Kōga clan. After the Iga clan launches a devastating attack on his village, Sasuke inherits the legacy of the Kōga Ninja Robot, a highly advanced mecha designed to protect the clan. Alongside his allies, including the resourceful ninja Kagerō and the tech-savvy scientist Dr. Saizō, Sasuke embarks on a mission to thwart the Iga clan's plans for global domination. The Iga clan, led by the ruthless Hanzo, seeks to harness the power of their own Ninja Robots to subjugate the world, leading to intense battles and strategic confrontations.

Throughout the series, Sasuke and his team face numerous challenges, including infiltrating enemy strongholds, deciphering ancient ninja scrolls, and mastering the full potential of their Ninja Robots. The narrative explores themes of loyalty, sacrifice, and the balance between tradition and technological advancement. Key plot points include the discovery of hidden ninja techniques, the unveiling of long-buried secrets about the origins of the Ninja Robots, and the eventual showdown between Sasuke and Hanzo.

The series is structured around episodic missions that gradually build toward a climactic final battle. Each episode features a mix of high-stakes combat, tactical planning, and character development, with a focus on the evolving dynamics within the Kōga team. The interplay between the human characters and their robotic counterparts adds depth to the story, highlighting the symbiotic relationship between ninja and machine. "Ninja Robots" combines action-packed sequences with a coherent narrative, making it a notable entry in the mecha-ninja genre.