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...Crimone is a vicious criminal organization. Shoko is a female investigator whose parents were killed by a man believed to be a member of Crimone. Since then, she has been investigating the group with a special feeling. One day, with the arrest of a low-ranking member of Crimone, details about their leader Marufuji, who had been shrouded in mystery for many years, are revealed... Shoko and her comrades begin preparations for Operation Roller to destroy Crimone. Meanwhile, Marufuji identifies the female investigator who has been sniffing around as Shoko. In an attempt to blackmail her into silence, he finds out her identity and kidnaps Shoko's younger sister Mina...