The film starts at an American lab where the boss is telling the Japanese assistant to go ahead an dump all of the chemicals down the drain. The water empties into the river and the chemicals create a sea creature that attacks the people. The family in the story run convenience stall next to the river and the creature runs off with their daughter. I'm not sure what to call this movie. Labeled at a horror or a comedy... I don't really see either. More along the lines of a bad science fiction than anything.
The film is not well known, and one that I saved for horror month because of the mislabeling as horror. It is one of the films that the 1001 movie book added on a revision, then removed a year later. It is kinda frustrating that a list of 1001 movies changes so much, but I'll digress from that argument.