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The spin-off series of the October hit drama *Killing Analysis Unit*, titled *Evil Fluctuations: Spin-off of Killing Analysis Unit*, features Yukihiro Tokura as the serial killer known as "Yagi Numao." The *Killing Analysis Unit* series is adapted from Masami Kazushi's police novels, *Metropolitan Police Department Killing Analysis Unit*. The first installment, *Stone Cocoon*, was released in 2015, followed by *Crystal Tremors* in 2016. These stories revolve around the investigations of bizarre murder cases led by Tomoko Asagi, played by Matsuoka Maki, and her partner and superior, Takeru Takagi, played by Takahiro Aoi, along with their colleagues in the Investigation Department. Yagi Numao, nicknamed "Toremi," is known as the "Killing Devil." At the age of six, he was kidnapped along with his mother, carrying a dark past. In the first episode, *Stone Cocoon*, he threatens Asagi and her team, but in the second, *Crystal Tremors*, he saves the police from a crisis, making him a highly notable and intriguing character in the series. The spin-off, *Evil Fluctuations*, delves into the events leading up to *Stone Cocoon*, detailing how Yagi Numao became Toremi. In the spin-off, Tokura continues to portray Yagi Numao, now renamed Naomi Nomuki, as he did in *Stone Cocoon* and *Crystal Tremors*. The directorial team, consisting of Teru Uchikata and Daisuke Yamamoto, who have been involved since the first installment, will also helm this spin-off, further developing the world of the *Killing Analysis Unit* series. The story explores the pivotal moment when a young man transforms into a cold-blooded serial killer. It delves into the reasons and motivations behind his transformation, presenting a suspenseful drama that reveals shocking truths and sends chills down the spine.