在北海道札幌的薄野区，有一位被称为万事通的侦探（大泉洋 饰）和他的搭档高田（松田龙平 饰）。在一个隆冬深夜，侦探常驻的酒吧“KELLER OHATA”里的黑色电话突然响起。“我想请你帮我把一封信交给某个人。”那个声音，是来自侦探曾经全心爱过的女人纯子（铃木京香 饰）。以这桩离奇的委托为契机，侦探和高田被卷入了一场巨大的阴谋。故事随即开始朝着谁也无法预料的方向发展。

Yukio Haruyama is an elementary school student. He has an uncle that teaches philosophy part-time at an university. His uncle leeches off his family. The uncle then goes on a blind date and falls in love with beautiful Eri Inaba. She is a fourth generation Japanese living in Hawaii. Sometime later, Eri goes back to Hawaii to take over a coffee farm left behind by her recently deceased grandmother. Yukio and his uncle travel to Hawaii to see Eri.

In the Susukino red light district of Sapporo, a private detective (Yo Oizumi) drinks alcohol with his driver Takada (Ryuhei Matsuda) in his favourite bar. There he receives a phone call from a woman who identifies herself as Kyoko Kondo. The woman asks the detective to complete a simple task. The detective, having an excellent sense for danger, thinks the work is easy and accepts the case. The next day he begins the investigation.