On Christmas Eve, a TV broadcasting station receives a phone call. The caller warns "I have set up a bomb at Ebisu in Tokyo." A contract worker for the TV broadcasting station and a housewife are accused by the Ebisu police as being the culprits. During this chaotic situation, a mysterious man silently watches as everything unfolds. A video clip is then uploaded to an online video website. The video contains a demand to talk with the Prime Minister during a live broadcast or a bomb will be detonated at 6 pm in Shibuya, Tokyo. Who is behind the bombings and who will stop them?

落英缤纷的季节，律师樱木建二（阿部宽饰）走在去龙山高中的路上。他巧遇了与流氓打架的矢岛勇介（山下智久饰），还有撕掉不及格考卷的水野直美（长泽雅美饰）。这两人都是龙山高中三年级的学生，实际上，龙山高中因为经营不善、升学率低下已经变成被人嘲笑、遗忘的破烂高中，而樱木建二这次到访，也是来处理该校申请破产的事宜。不过，樱木建二并不甘于草草了事，曾经是暴走族的他，想要做出轰动全日本的大事。一个热血的想法在他脑中萌发：带领龙山高中的笨蛋学生们考取日本第一的大学——东京大学。于是，樱木建二与英语教师井野真真子（长谷川京子饰）一起开始了这个不可能完成的教学任务。