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Narcotics investigators Haru Kurabayashi and Kai Eto follow the trail of a dangerous new drug. To reach those behind it, they take separate undercover assignments, one among the dealers and the other close to a suspected source of production.

The deeper they enter these circles, the harder it becomes to distinguish a useful contact from a threat. Their contrasting temperaments must work together as the investigation exposes secrets that cannot be solved by an arrest alone.