A newcomer, Nozomu Kotaki, was assigned to the new full-time investigation team. Although it is a career group graduated from the University of Tokyo, it is said that the new full-time investigation team has been assigned as an elite group led by Yu Amagi (Noriyuki Higashiyama). Everyone who welcomes the appearance of newcomers who are refreshing, fresh and look good. Tamaki Mizuta (Kana Kurashina) will be in charge of education.
Meanwhile, a murder case occurs in which a university professor is stabbed in the chest with a fountain pen. Amagi, Tamaki, Yoshiki Ebisawa (Seiichi Tanabe), Takumi Nonomura (Jin Shirasu), and Shin Aoyama (Takashi Tsukamoto) are all on the scene. I felt the criminal's anomaly in the crime of sticking many fountain pens in my chest.
An investigation meeting was started centered on Masatoshi Katagiri (Kotaro Yoshida), but the victim was 'academic harassment (= the act of harassing students by abusing educational power) and the reputation of the students was the worst. And Amagi points out the connection with the murder of a female owner a week ago.
On the other hand, Michitoshi, who was participating in the meeting remotely from the share box, told SNS that his handle name 'harassment killer' complained about the harassment damage of university professors and female business owners. ], And find out that the image that only the criminal can shoot was uploaded. According to the judicial autopsy of Shuntaro Domoto (Kinya Kitaoji), 'the criminal is showing off this murder rather than the murderous intention' ... Is the true criminal the 'harassment killer' !?
Can they safely resolve the series of highly anonymous murder cases that occur one after another?
And a sudden farewell to the new full-time investigation team who just welcomed a new member...

One night's park. The orange light floating in the dark sways up, down, left and right, rises, and then suddenly disappears.
The next morning, the stabbed body of Masahiko Isomura (Yu Miyazawa) was found in the park. Yu Amagi (Noriyuki Higashiyama), Yoshiki Ebisawa (Seiichi Tanabe), Michitoshi Sakashita (Nozomu Kotaki), and Shin Aoyama (Takashi Tsukamoto) who visited the site have no evidence of fighting in a place without street lights. , Also consider the crimes of acquaintances. However, the area around the park at night is dominated by darkness, and it seems difficult to find witnesses. Meanwhile, Ebisawa feels a fuss and relentlessly searches for witnesses with his reluctant Satoshi Komiyaji. On the other hand, Amagi and Aoyama started the investigation from a shoe mark different from that of the victim left on the scene.