This little-known Japanese wire-action platformer, with a very well-made rubber wire physics simulating engine, sports a schoolgirl setting out to rid the world of giant mutant fish.
The game is very easy to win, but very difficult to play (try it). This video demonstrates one of the fastest paths to the ending, including quite a few almost impossible maneuvers ― whether playing tool-assisted or not.
This video is a 7 seconds improvement to the previous version.
See the Umihara Kawase page for more information about this game, and the author's comments for more information about this movie.