A boy called Gon was on the verge of death, when suddenly gills started to grow and he could breathe again. Kang Ha and his grandpa rescue Gon and together they become an odd family. This film explores life's paradoxes, blessings and curses. It will encourage you to think about your own "gills" to help you get through your life.

故事发生在密歇根州的一座小镇，可怕的杀人七鳃鳗闹得当地居民人心惶惶。无论你是去泳池游泳，还是去厕所坐马桶，杀人七鳃鳗随时可能出现，让你稀里糊涂地丢掉性命。七鳃鳗是一种长着巨齿、漏斗状嘴并且能利用细长的身体在城市下水道中自由穿行的鳗鱼。当它们大开杀戒之时，无论你躲在哪里都不安全。下一个受害人会是谁？