A bad cop is engaged in a violent chase to catch a yakuza boss. In his absence his wife runs away with another man, who turns out to be the very same man that her husband is hunting. Once he discovers this, he loses his nerve and turns in his badge. But the chase turns into a personal vendetta where the ex-cop plans to wipe out the entire gang.

Tamotsu Inukai is a married middle-aged man with a wife, daughter and son. Mr. Inukai has a strong dislike for dogs, but while he is working on the island his family takes in a Samoyed dog to fill in the father's absence, the family decides to raise the dog. At first Mr. Inukai opposes the family taking the dog in, but he can't persuade his family to abandon the dog. When Mr. Inukai arrives back in Tokyo, he now has to has to live with the Samoyed dog. Can he?

共同拥有同一个悲伤过去的IMAT青年医师日向晶（玉木宏 饰）和搜查一课SIT特别班的影浦琢磨（田中圭 饰），在完成了宿命般的重逢后，彼此间理解与羁绊似乎也慢慢加深。转眼一年半过去，日向在一次行动中救助的17岁少女桥亚纪（杉咲花 饰）即将进行心脏移植手术，他为此颇为挂心。另一方面，已经离开SIT的影浦受命担任政治家福泽荣吉（清水章吾 饰）的SP，福泽恰恰是26年前爆炸事件的警方直接负责人。仔警护当天，政治家乘坐的公交突然遭到数名不明身份之人的劫持。与此同时，正在手术的亚纪，捐赠来的心脏突然爆炸。为此事牵肠挂肚的日向，就在此时接到了带领IMAT赶往劫持公交车现场的任务。 史上最恶四小时，日向和影浦莫大的磨难……