Takako Meguro, a typical office worker known to her friends as Medaka, starts a new career as a night school teacher when her company restructures. At first, she's not so crazy about her new job and gets by with a minimum of effort. But as she continues, she finds out it's quite a challenge after all. Her students range from a high school dropout to a salaried worker, and also include a self-employed fellow, and a cabaret hostess, in short, a motley crew! What's more, half of them are older than her and, to make matters worse, one of them is a elementary school classmate. But a certain turn of events results in Medaka's becoming a really dedicated teacher! Although she's surprised herself at this change of character, her trials are just about to begin.

绰号“大目鱼”的目黑隆子（MIMURA饰演）是个平凡的上班族，才出社会半年就被公司裁员，只好转行当夜校高中老师。原本只想轻松度日、不把教书当一回事的隆子，踏进教室以後才发现，自己竟然是班上人生经验最嫩的菜鸟！

学生里不但有自己的小学同学、中年失意的上班族、醉醺醺的花店老板、甚至还有兼差当酒店小姐的单亲妈妈！来自四面八方、背景完全不同的学生齐聚一堂，每个人都有自己的故事，与不为人知的辛酸。而隆子也在与学生的相处过程当中，渐渐找回对人生的热情与冲劲，更意外发展出一段三角恋情……

어린 시절부터 메다카(송사리)라는 별명을 가진 주인공 메구로 타카코는 평범한 직장인으로 지내다가 정리해고를 당하게 되고, 우연한 계기로 자신이 가지고 있던 교원자격을 살려 고등학교의 교사가 되면서 일어나는 이야기들을 담고 있는 드라마