Most koi fish did not lead very interesting lives. Their daily routine consists of aimlessly roaming around a pond to appease the ogling glances of their owners, scorounging about for morsels of food, and... breathing.
Sushi never really enjoyed his existence very much, and always dreamt that there was something more beyond his pond. After several years of this monotonus lifestyle, Sushi decided he couldn't take it anymore. He concocted a dicey plan to escape the shackles of his shallow prison.
Sushi's owners used a custom filtration system that allowed the runoff from a nearby stream to cycle in an out of the small pond. He figured if he could swim through the filter while it was open, he could get to the stream on the other side.
However, Sushi didn't have the best timing on his way through.