Newcomer Rotoshi Sakashita (Nozomu Kotaki) is assigned to a new task force. Under such circumstances, a university professor is stabbed in the chest with a fountain pen and murdered. Yuu Amagi (Noriyuki Higashiyama), Tamaki Mizuta (Kana Kurashina), Yoshiki Ebisawa (Seichi Tanabe), Takumi Nonomura (Jin Shirasu), Arata Aoyama (Takashi Tsukamoto) and others immediately go to the scene. From the criminal act of stabbing the chest with several fountain pens, the murderer's abnormality is felt. The victim was evaluated badly because of "academic harassment", and Amagi pointed out that this was related to the murder of a female manager a week ago. Rotoshi found out on the Internet that among the people who liked the SNS posts accusing university professors and female managers of harassment, a netizen named "Harassment Killer" uploaded images that only the criminal could take. At the same time, the new task force that had just welcomed new members suddenly parted again. @哦撸马 (阿点)