As a series of horrific murders occur in Tokyo, information program director Tsutsui Mankoto (Kishii Yukino) meets a mysterious man, Shitara Hiroki (Shison Jun), at the scene of an investigation. Mankoto is a freelance writer for a weekly magazine, and ends up covering the serial murders with Hiroki, a renowned reporter who has named the murders "The Eye of Horus Murders." The two gradually become attracted to each other, but... This fateful encounter is the entrance to a "darkness" swirling with suspicion and conflict. Believe it or not, the ultimate love mystery begins!!

While reporting on the serial murders known as the Eye of Horus murders, information program director Tsutsui Mankoto (Kishi Yukino) gradually becomes attracted to Shitara Hiroki (Shison Jun), a famous weekly magazine writer. Mankoto becomes the chief of the exclusive reporting team for the case, but she cannot shake her reluctance to turn her camera on the bereaved families. However, as she and Hiroki continue their reporting, something changes... As detective Komine Masaaki (Shirasawa Jin) begins to turn his suspicious eye towards Hiroki, an unexpected situation occurs and the two suddenly become closer...!?

Koki (Shison Jun) and Mankoto (Kishii Yukino) spend the night together. However, Koki acts as if nothing happened, leaving Mankoto in a quandary... Meanwhile, the two receive reports of a "black raincoat man" who is believed to be the culprit in the Eye of Horus murders. Mankoto realizes that a certain pattern has been hidden in the previous crime scenes, and the location of the fifth crime emerges...! Meanwhile, detective Masanori (Shirasawa Jin) becomes increasingly suspicious of Koki... As their romance develops rapidly, Koki's past is finally revealed!!

Mankoto (Kishi Yukino) learns that the "suspicious man" who has been appearing at the scene where the fifth Horus Eye Murder is likely to occur is Hiroki's (Shison Jun) father, Kanji (Hagiwara Masato). Could Kanji be the Horus murderer? Thinking of Hiroki's complicated feelings, Mankoto is even more passionate about solving the case. Meanwhile, while the police are pursuing Kanji as a key witness, Masamasa (Shirasawa Jin) cannot wipe away his doubts about Hiroki... On the fateful day of May 5th, Mankoto, who is staking out the scene, encounters a man in a black raincoat --!?

The fifth body of the Eye of Horus murder case has been discovered. DNA testing has confirmed that the culprit is the same person who attacked Mankin (Kishi Yukino). Meanwhile, the police suspect that the perpetrator is Hiroki's (Shison Jun) father, Kanji (Hagiwara Masato), and are searching for him. As the injection marks found on the body give rise to a picture of the culprit, Mankin receives information one after another that suggests that Hiroki may be the real culprit behind the Eye of Horus murder... Wanting to believe in Hiroki, Mankin heads to his room to dispel her doubts, but a shocking truth awaits her!