Investigators who gather at the International Crime Investigation Headquarters disappear one by one. Anri Nanase, who was transferred from the Sendai branch, joined the agency after graduating from an elite university, and was expected to advance in her career, but her extreme aversion to violence caused her troubles, and she was separated from the front lines. She was assigned to the general affairs department at the branch office. Since Nanase has been assigned to a state crime unit, Sakakibara of the Secret Investigation Division suspects an ``unseen background force.'' Things will start to change soon after she is assigned. Who on earth is she? 
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