The 300 million yen robbery (San Oku En Jiken), also known as the 300 million yen affair or incident,was the single largest heist in Japanese history at the time. It occurred on the morning of December 10, 1968, in Tokyo,Japan. Half a century later, the case remains unsolved. 7 years later,just before just before the statute of limitations, Sawatari, a journalist, found out about the mind behind the crime is Matsuda, a businessman currently living in America. He traveled to America and asked Matsuda for the truth. Matsuda told him a story of how he, a former police officer, became friends with Joe, a bad boy, and Rock, who is shy and sensitive. Matsuda's sister committed suicide after being raped, and Matsuda lost his job after he made a scene in the financial institute his sister used to work. Matsuda, Joe, and Rock decided to do something big in revenge, so they decided on robbing a cash carrier.

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