The truth of the incident two years ago when Sena Kuraki (Sim Eun Kyung) , a former partner of Wataru Manjo (Shingo Katori) , fell into a deadly bullet, and the finger-to-member members who arrived at the true identity of Anonymous. However, the runaway of Anonymous, which damages the credibility of the police and advocates the enforcement of justice by collective intelligence, cannot be stopped. While not only the Internet people but also public opinion began to support Anonymous, even the key person to prevent the runaway, Detective Director Shirogasaki (Katsumi Takahashi), disappeared ... The final battle against Anonymous begins!

万丞渉（香取慎吾）の元相棒・倉木セナ（シム・ウンギョン）が凶弾に倒れた２年前の事件の真相、そしてアノニマスの正体に辿り着いた指対メンバーたち。だが、警察の信用を失墜させ、集合知による正義の執行を唱えるアノニマスの暴走は歯止めが効かない。ネット民だけでなく世論までもがアノニマスの支持を始める中、暴走阻止のキーパーソン・城ヶ崎刑事部長（高橋克実）までもが行方をくらまし…。対アノニマス最後の闘いが始まる！