Reportedly observed on multiple occasions by crew members of government-operated “whale research” ships, these so-called “Ningen” (lit. “humans”) are said to be completely white in color with an estimated length of 20 to 30 meters. Eyewitnesses describe them as having a human-like shape, often with legs, arms, and even five-fingered hands. Sometimes they are described as having fins or a large mermaid-like tail instead of legs. The only visible facial features are the eyes and mouth.
According to one account, crew members on deck observed what they initially thought was a foreign submarine in the distance. When they approached, however, it became clear from the irregular shape of the thing that it was not man-made — it was alive. The creature quickly disappeared under water.
For the most part, the existence of the Ningen is considered an urban legend. Much of the information about this rumored creature can be traced back to a series of posts on the 2channel forums, written by a person describing the experience of a friend employed on a government “whale research” vessel.
To date, no solid evidence has been presented to confirm the existence of the Ningen. The government is believed to have kept detailed records of the sightings, but they have released no information to the public and have reportedly instructed eyewitnesses to remain silent.