Shiba, a detective in the fifth anti-organized crime division of the Tokyo Metropolitan Police, a.k.a. Anti-Gang 5, is on the handgun smuggling beat. A so-called handgun confiscation specialist, the most important element of his investigations is the information gathering skills of his undercover informant S. Shiba's S, Munechika, also happens to be a big-time yakuza. Though he was aware of the special feelings he had for Munechika, Shiba chose the life of a detective. Thinking of each other, they swear to protect their relationship as S and detective. But then one day, a mysterious young man named Black appears before Shiba, and everything falls apart!
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