To deal with the increasing violent crime rate in the Shinjuku area of Tokyo, a special investigation team is formed at the Shinjuku Police Station. Detective Shunsuke Yamashita and Detective Keiichi Tashiro begin work at the special investigation team. Detective Shunsuke Yamashita doesn't care about details and says what he thinks. Meanwhile, Detective Keiichi Tashiro is diligent and enthusiastic with his investigative work. The two men frequently argue, but also cooperate to solve the cases.
