这位单身母亲独自抚养她可爱的女儿（荒田爱一饰演），但她的女儿最终淹死在游泳池里。警方认定这是一起事故，而森口则认定他的女儿死于班上两名学生之手。她默默地指责囚犯A和B，并宣布她将以自己的方式寻求报复。之后，森口辞去了教职，在B班待了一年的学生也怀着焦虑的心情迎来了春假。新学期伊始，一场残酷的风暴袭击了这群无知无畏的年轻男女。。。这部电影改编自慈奥的原作，并成为2010年腾讯电影报告的十大电影之一；第34届日本电影学院奖获得四项大奖：最佳作品、最佳导演、最佳剧本和最佳剪辑。
Video artist Ryosuke visits the suburb of Furano in Hokkaido, tuikan.cc where his friend lives, in order to shoot a video. His car breaks down and Ryosuke decides to walk to a house and ask for a phone. The person that opens the door is his former girlfriend and first love Haruka. They meet for the first time in 23 years. Even though Ryosuke knows that she is married, he takes her to his video shooting and they get close. Ryosuke leaves Hokkaido in 2 days and he asks Haruka to spend one more day with him.
