新泻县奥远和水库是全日本最大的水库，一日，猛烈的暴风雪令许多人被困在了水库中，水坝控制员富坚辉男和同事吉冈和志为了救人而踏上了艰险的旅程。在拯救了遇难者之后，吉冈受了伤无法行动，富坚独自下山请求支援，哪知道在茫茫的暴风雪中迷了路，导致了志刚的死亡，这成为了富坚内心里一块巨大的伤痛。 　　两个月后，吉冈的未婚妻千晶前来祭拜未婚夫曾经奋战过的土地，让富坚没有想到的是，在这个节骨眼上，水库竟然被一帮恐怖分子占领了，他们封锁了通往水库的唯一一条道路，向政府要挟巨额的赎金，不然就要将水库炸毁，这意味着，水库里囤积的水资源将会夺走水库下的二十万居民的性命。A group of terrorists has taken hold of the largest dam in Japan. They also capture the workers as hostages, and demanded JPY$5 billion from the government with a 24 hour deadline in exchange for the lives of the hostages. To make things more complicated, there was a snowstorm and no one can get in or out near the area. Fortunately, the terrorists did not capture Togashi, the dam controller, and he is the only person who can rescue those hostages from the terrorists...