Toshiyuki Tanishi (Ryuhei Maruyama) is 27-year-old single guy, who has never had a girlfriend in his whole life. He works for small toy company, Saida Company. People view Toshiyuki Tanishi as stupid and the last person who will achieve success. Meanwhile, Toshiyuki has feelings for co-worker Chiharu (Akina Minami), but is unable to approach Chiharu. Instead, Toshiyuki goes to telephone clubs or watch adult videos.

One day, Toshiyuki gets along with the salesman Aoyama (Takumi Saito), from rival company Manmos. With Aoyama's suggestion, Toshiyuki is finally able to have dinner with Chiharu. After dinner, Toshiyuki and Chiharu miss the last train and go to a hotel.

本故事中的田西敏行（丸山隆平 饰）相貌平平，性格胆小懦弱，是个27岁还没谈过恋爱的废柴处男。他在斋田产业公司担任销售员，公司新来了个漂亮的同事植村千春（南明奈 饰），敏行心里暗暗喜欢，却不之如何取得千春的欢心。正在犯难之时，此时同样也是销售员的青山贵博（斋藤工 饰）给敏行出主意想办法，教敏行怎样把千春追到手。在他的帮助下敏行和千春的关系更拉近了距离，不料一天敏行来看望生病的千春时，敏行和千春邻居志穗（佐藤江梨子 饰）闹出了一场误会，使千春和敏行彻底断绝了联系。不久后千春就与很会讨女孩子喜欢的青山搞在了一起。敏行的桃花是否就此断绝，他到底能不能摆脱处男之身交到女朋友呢？