While investigating the Eye of Horus murder, Mankoto (Kishi Yukino) finds out that Koki (Shison Jun) is living with a strange woman (Saito Asuka) and breaks up with him. As the possibility emerges that the Horus murderer may have taken the victim's blood home with him, Masamasa (Shirasawa Jin) learns the reason why Koki is so obsessed with "blood". Meanwhile, Mankoto's junior colleague Kinoshita (Kobayashi Toranosuke) receives a report of an eyewitness to the murder, which makes Kinoshita excited, but... As the love quadrangle takes a major turn, an unexpected tragedy unfolds!