Lord Oda Nobunaga plans to control Japan where rival warlords battle by waging war against several clans. His vassal Araki Murashige stages a rebellion and promptly disappears.
In her beloved car, "Grace", a wife is on her way to Narita. Following a bus accident that kills her, her husband, Kikuo, gets access to her GPS which contains the history of all the places she travelled to without his knowledge. Suspecting infidelity, Kikuo embarks on a journey to trace the history of the car's GPS in order to solve the mystery.
Kamata Maro (Tsukamoto Takashi), a freelancer who calls himself a detective, works part-time at a yakiniku restaurant in Kyoto, while living a carefree life. He spends his free time with Gennosuke (Daichi Asai), a bumbling fighter, and Kenta (Yuta Yamazaki), a genius hacker. One day, he receives a request from his favourite cabaret girl to search for his missing father.
Ami, who lives a peaceful married life, meets Jun, a young painter, due to an incident at work one day. She takes on the role of a painting model lightheartedly, but the two gradually become strongly attracted to each other.
The story continues from the Japanese SIGNAL drama series. In 2021, a limousine taxi driver causes an accident on a highway, and a high-level government official dies in the accident. The cold case investigation unit, including Kento Saegusa and team leader Misaki Sakurai, have doubts about the case. Meanwhile, in 2009, administrative officers die consecutively in car accidents. The police announce these deaths as accidents. Takeshi Ōyama believes that these deaths were not the product of simple accidents. At 11:23 pm, a walkie-talkie turns on and makes a connection between the future and past. Kento Saegusa and Takeshi Ōyama face the threat of bioterrorism.
Kyosuke Fushimi is a former detective from e Kanagawa Prefectural Police Department's Homicide Division who currently works as a special agent of KSBC (Kanagawa Prefectural Police Department Investigation Analysis Center). He uses his genius brain and knowledge of past crimes to solve difficult cases. He also make use KSBC's latest investigation ability to find the serial killer who murdered his lover.
Reiko Akutsu works for a residential construction company. She plans a lunch matchmaking meeting to find love with someone in the same company. New employee Yuika Amano offers to join the matchmaking event. Yuika Amano and Reiko Akutsu hold the luncheon and meet two men. During their lunch, Yuika Amano and Reiko Akutsu hear a story filled with riddles by the two men. Yuika Amano can't help but to solve the riddles. Going forward, during their lunch matchmaking meetings, Yuika Amano hears various stories involving things like ghosts or missing people and she attempts to solve the mysteries.
Tsugumi, who works at an interior design firm, has an unexpected encounter with her first love from high school, Itsuki, at a dinner with her client’s whole comp any, an architectural firm. Seeing Itsuki, who is a registered architect with a first-class license and is quite charming, brings back the faint memories from high school. In the middle of dinner, he quietly slips away and begins to head home, getting into a wheelchair. “You didn’t know? Itsuki was in an accident in college, and he can’t walk.” Tsugumi, her pulse racing, takes a step back and thinks to herself, “I can’t love someone in a wheelchair. It’s just not possible to date someone like that.” But when she accepts the reality of the situation and interacts with Itsuki, who struggles but fights to survive each day, she becomes overwhelmed with emotions that she has kept since her youth.