Elite office worker Masato Kamishiro (Hiroki Narimiya) and his wife Mio (Miori Takimoto) were living a smooth-sailing married life. But one day, Mio realizes that a photo sent by Masato, who was supposed to be away on a business trip, is an alibi photo he picked up from the internet. A hint of doubt is brought into their peaceful daily life. Furthermore, a "murder of a female journalist" has occurred in the neighborhood, and it has been making the news day after day with the culprit still at large. Something begins to fall apart behind the scenes of their happy marriage...

Detective Tomizawa (Yamaguchi Makiya) visits Mio Kamishiro (Takimoto Miori), who works at a patisserie, to investigate the "murder of a female journalist." The victim, Yuhi Minamizawa (Kumada Rinka), frequently visited the patisserie, despite not liking sweets. Furthermore, a mysterious man (Hosoda Yoshihiko) who moved into the room next to the Kamishiro couple has been watching and eavesdropping on Masato Kamishiro (Narimiya Hiroki) and Mio. Meanwhile, a new incident unfolds.

Ayaka Koizumi (Miku Tanaka), a colleague of Mio Kamishiro (Mio Takimoto), is found dead. Pastry chef Joji Oyamada (Jin Katagiri), who had been threatened by Ayaka, is being investigated as a key witness in the murder of female journalist Yuhi Minamizawa (Rinka Kumada ). Masato Kamishiro (Hiroki Narimiya) tries to calm the anxious Mio, but behind the scenes he has been meeting with investor Masumi Nagano (Mariko Tsutsui). Masato's true colors are starting to come out...

Masato Kamishiro (Hiroki Narimiya) and Mio (Mio Takimoto) promise to hold their wedding just the two of them on their wedding anniversary trip.

In fact, Masato has taken out a large amount of life insurance on Mio and is planning to kill her during the trip. Mizuki Segawa (Reina Matsui), a psychiatrist, is worried that Mio's dependency on Masato is getting worse. Meanwhile, Souma Ishiguro (Yoshihiko Hosoda), who believes Masato is the real culprit of the murder, travels to Kobe to trace the past of Masato, an orphan of the earthquake disaster. Why did Yuhi Minamizawa (Rinka Kumada) have to be killed?

Ishiguro Souma (Hosoda Yoshihiko) visits Detective Tomizawa (Yamaguchi Makiya) with the interview data on Kamishiro Masato (Narimiya Hiroki) that Minamizawa Yuhi (Kumada Rinka) risked her life to obtain. The data reveals a truth about Masato that is hard to believe. Masato's past and true nature are revealed. What is Masato planning?

The true identity of Kamishiro Masato (Narimiya Hiroki) is gradually revealed. Detective Inspector Tomizawa (Yamaguchi Makiya) decides to start the investigation into the murders of Minamisawa Yuhi (Kumada Rinka) and Koizumi Ayaha (Minamisawa Yuhi) from scratch. Meanwhile, Masato and Mio (Takimoto Miori) are preparing for their wedding anniversary trip. Masato's plan to murder Mio for the insurance money reaches its final stage. His former lover Nagano Masumi (Tsutsui Mariko) appears. Meanwhile, Ishiguro Souma (Hosoda Yoshihiko) contacts Mio and the turbulent final chapter begins.

Mio Kamishiro (Miori Takimoto) and Souma Ishiguro (Yoshihiko Hosoda) desperately try to escape Masato Kamishiro (Hiroki Narimiya), but he gradually closes in on them. When they can no longer escape, what decision will Mio make? Where will the "ultimate love" of the murderer Masato and Mio lead...?