Special agents Anju, Miura Sayaka, and Yuka Satsuki from the National Security Bureau were engaged in a mission to apprehend an illegal arms trafficking ring when they encountered a critical incident—their comrade Miura was shot dead. Three new operatives were summoned as replacements, and the team resumed their investigation by tailing a suspect. However, during the operation, Miura suddenly vanished without a trace. Anju and Yuka rushed to her location, only to discover the corpse of their murdered teammate and the chaotic, lawless state of the criminal organization.