Sayaka Kudo is a gyaru who wears miniskirts and dyes her hair blonde. Although she is a 2nd year senior high school student, she is on par academically with 4th grade elementary school students. She frequently transfers between school because she is unable to make friends, and was once suspended for being caught with cigarettes. To prepare her for her university entrance examination, her mother decides to send her to Seiho Cram School. However, when the school director, Yoshitaka Tsubota, hears about Sayaka's academic problem, he makes it his personal achievement to help her enter the university of her choice, Keio University, a prestigious university that is considered one of the most difficult to enter in Japan. After her father labels her an "air-head", Sayaka became determined to study hard to prove her father wrong. Over the course of the summer holidays of her second year through to the exams at the end of her third year in senior high school, Sayaka studies extremely hard. She even removes her blond hair dye and cuts her hair to show her resolve. Her results progressively improves and her academic deviation value increases tremendously from 30 to 70 in this short span of time. 你的生活就会变得完全不一样。有一股洪荒之力填满心间，撸起袖子像能再战一个高三。。别再给教育注入这样一剂鸡汤了。哭着滚出电影院的片子。阳光导师——坪田先生。终有一天，我们都会喜欢上那个不顾一切，全力拼搏的自己。也许这也曾是我的青春。这辈子你可能都不会再那么努力！！！。细数垫底辣妹那些感动的瞬间。一碗低毒鸡汤——十年前或是现在，都去种树吧。 长相甜美的高中女孩工藤沙耶加（有村架纯 饰）在家并不受父亲待见，父亲一心要把弟弟培养成棒球手，而疏于对女儿们的呵护。沙耶加所在的高中有内部升学的制度，因此她终日和小姐妹们吃喝玩乐，学习掉到了全年级倒数第一也毫不为意。温柔勤苦的妈妈（吉田羊 饰）经常被校方找去说教，她为女儿的未来焦虑万分，因此将沙耶加送到了坪田（伊藤淳史 饰）所开办的补习班。经过水平测试，沙耶加实际只有小学四年级的水平，不过开朗自信的坪田不以为意，他以特有的方式打开女孩的心防，两人很快成为好朋友。在坪田的帮助下，沙耶加对学习的态度逐渐浓厚，后来更立下了考取庆应大学的宏愿。这是丑小鸭绝地逆袭的真实故事…… 本片根据《年级倒数第一的辣妹一年内偏差值提升40以上并考入庆应大学的故事》改编，该书取材自真人真事，由担任影片女主角原型小林沙耶加的私塾教师坪田信贵撰写。
