Akari Niimura, a special investigator of the security force SSA, who is said to have disappeared during the mission to annihilate the arms trafficking organization a year ago, and Aya Shiomi, a young special investigator who could not be convinced by the report, are seniors. In order to find out the truth about Akari's disappearance, Aya went into the scene of the incident alone and used the inherited "Shiomi-style martial arts" to defeat the terrorists who stood up one after another.