Photos taken within the Fukushima exclusion zone.
Witnesses describe it as an oily-black creature with either very stunted legs or an actual fish-tail. It strides around on abnormally long arms.
Image drawn by a child in Souma, over 30KM north of Fukushima.
Feel free to post any evidence you may have found yourself in the comments section.
(And by that I mean: doctor your own photos to perpetuate the myth)