Astronomer Shinichi Tachibana has a secret identity as the superhero "Iron Sharp" and is well beloved by children. When they are attacked by a group of metallic aliens, Iron Sharp drives the aliens away. The resourceful Tachibana helps develop an electric barrier to block the aliens from coming to the Earth. After several losses by the aliens, they announce that they will invade the Earth, throwing the world into a state of panic.

The murder took place at a hotel in Matsushima. The victim is a woman about 28 years old. The suspect is a young man who visited her the night before, and the evidence, in addition to shoe horns and handkerchiefs, is soap with the name of the tavern. When detectives at Shiogama Station followed the man's tracks, it turned out that he had come from Ueno.

Patrol car 108 is on the prowl in Tokyo when it comes across a suspicious small truck. When the policeman investigates he is shot and the truck makes its getaway.

A man who uses marriage as bait goes from woman to woman, and then a horrific murder is committed for money. Seven police man chase the vicious criminal who disappeared into the vortex of the big city.

A tragic drama - a dismembered torso of a woman rises up on the banks of the Arakawa River. The body is only the torso. Her legs were discovered on the opposite bank. The only clue, a man was trying to throw something in from a car with a license plate number three days ago at Shin-Arakawa Ohashi Bridge...

In a corner of a warehouse at Shiodome Station, a alumni trunk, is found with the terrible smell of decay. The dead body of a woman is inside. Since the trunk was shipped from Osaka Tennoji Station, the murder investigation headquarters were established in Tokyo and Osaka

The fourth installment of G-men of Japan

A human drama of crew and passengers on a special express train named “Sakura” from Tokyo to Nagasaki...