Episode 4

It is revealed that Anna, who had been working alongside them, is actually an undercover agent for Public Security. Confronted by Sano, she discloses her true objective—a revelation that exposes the shocking reality of the police investigation surrounding "ALIUS," far exceeding anything they had imagined. Sano and Kanzaki are left speechless by the news. Yet, the identity of the serial killer and their true motives remain a mystery. Encouraged by Kanzaki's words, Sano resolves once more to uncover the truth behind the case.