一条生活在海洋里的马鲛鱼被渔网捕捉,而后被困在了一家海鲜餐馆的水箱里。从那以后她不屈不挠地寻找逃脱的方法。跟水箱里其他来自渔场的鱼不同,悲观的怀疑论者“老比目鱼”也生长在大海。作为水箱里幸存时间最长的一条鱼,他凭借其生存之道控制着其他的鱼。对他而言,马鲛鱼试图逃出水箱的举动已经对他的统治构成了威胁。A mackerel from the sea attempts to escape from the sushi restaurant! 'Flappy' is a mackerel from the sea. It is caught in a net and gets dumped into a restaurant tank. An old flatfish is the only one that's survived that long in a place where death was set. He is the one who gets the trust of other fish from fish farms with his know-hows to survival. Thanks to 'Flappy' who attempts to make it back to the ocean, the peace in the tank is shattered and conflicts with the old flatfish gets bigger and bigger. Will Flappy be able to achieve his dream?