A courageous robot superhero battles a masked villain in pre-war Japan. Tank Tankuro, one of the most famous manga characters of his time, embarks on a series of adventures with his friend Key-ko. Their primary objective is to thwart the nefarious plans of their masked adversary, Kuro-kabuto. The narrative unfolds through slam-bang action and humorous encounters, showcasing the bravery of the titular robot.

This collection of pre-war manga showcases a foundational work in the robot superhero genre. The stories are characterized by their blend of energetic action and lighthearted humor, appealing to a broad audience. Readers can expect to see the early adventures of a character who became iconic in his time. The narrative structure focuses on episodic battles and the clear-cut conflict between good and evil, typical of superhero tales.