Teiichi Akaba is a student at a prestigious private male high school known for producing important politicians and bureaucrats. His dream is to become the prime minster and make his own country. To help achieve his dream, he wants to become elected as his school's student council president. The elected student president receives privileges and a better chance for promotions later in the political & bureaucrat world. A power struggle takes place surrounding the student election.

故事发生在20世纪80年代，中学生三桥贵志（贺来贤人 饰）和伊藤真司（伊藤健太郎 饰）转学来到新的学校，为了看起来凶恶一点，他们不约而同改换了不良少年的打扮。刚刚入学，两人意外打倒十人，一战成名。此后他们结识了女校的戏精大姐大早川京子（桥本环奈 饰）、男校的大嗓门傻老大今井（太贺 饰）、今井的小跟班谷川（矢本悠马 饰）以及本校的功夫纪律委员赤坂理子（清野菜名 饰）。在与黑道分子和其他学校不良少年的抗争过程中，少男少女的友情不断加深，而爆笑沙雕的故事也接二连三的发生。三桥与伊藤的确度过了一段难忘的青春岁月……
本片根据同名漫画改编。

90年代的日本，6名女子高中生组成了「SUNNY」，一起经历了美好的青春岁月，更希望可以一直在一起…转眼20年过去，她们却各自踏上不一样的路，过着毫无交集的生活。某天，已经成为家庭主妇的奈美，竟遇上另一成员芹香，更意想不到的是好友身患重病，时日无多…她唯一的愿望就是跟「SUNNY」成员重聚！为了实现芹香最后的心愿，奈美展开了寻找昔日好友之旅…

Following a group of friends from university as they progress into middle-age life and go their own separate ways.

A bullied teenage girl forms an unlikely friendship with a mysterious young man who protects her from her assailants, while she copes with the pressures of her final examinations.

特别篇中，仲野太贺继续饰演今井胜俊，新川优爱、樱井日奈子加盟出演不知为何对今井热情高涨的女大学生。