Ichiko is a 30-year-old unemployed woman. She meets Ryoichi at a drinking establishment. Even though he is a lot younger than her, she can't forget him. Meanwhile, Ichiko has 5 different characters in her brain that governs her actions. The 5 characters are Yoshida, Ishibashi, Ikeda, Hatoko and Kishi. These 5 character then have a fierce meeting. Yoshida presides over the meeting as the chairman. Ishibashi is the optimist. Ikeda is the pessimist. Hatoko is the character that lives in the moment and Kishi thinks about the past.

天野绢惠（香里奈 饰），越前屋百货床上用品店的销售员。打扮朴素甚至有点土气的绢惠非常热爱销售的工作，且十分卖力，极具亲和力的她销售业绩遥遥领先。某一天，绢惠突然被调动到了女装部。不同于床上用品的家居风，这是个竞争极强烈的地方。女装部的负责人神保美姬（黑木瞳 饰）则是个传说中的人物，她要求极为严苛，对绢惠的打扮更是看不顺眼。绢惠的新工作就在不顺利中开展。
由于绢惠自己对服饰的零品味，让她的新工作四处碰壁好不灰心。为了在女装部生存，绢惠开始从内到外进行大改造，渐渐走上了时尚之路。最初对绢惠很挑剔的神保也慢慢对其改观。但与此同时，绢惠的感情生活却有了裂痕。一出百货商场的《穿普拉达的恶魔》故事就此展开……