第 1 季，第 6 集: Kase visits Yu, who was taken away by the police. Yu confesses that he was the one who murdered not only Akira, but also the victim fifteen years ago. Furthermore, Kase learns that Yu’s struggle with Akira at the park was recorded in his earphone camera and decides to analyze the video data. Meanwhile, Rio is worried about how Yu might be treated and feels uneasy. Kase informs her of the situation Yu is in and kindly comforts her, which helps Rio manage to fall asleep. Goto and her older brother Masanobu want Rio to take responsibility for Yu as CEO, while the video data analysis that Kase ordered from a civilian forensic investigator is finally done. Kase is suspicious about something. Daiki and the police are also gathering evidence to back up Yu’s testimony.