Shibasaki Kaori is a doctor. Her patient that she was having an affair with dies. Kaori is suspicious of the patient's son Kido Takashi about the death. Noguchi Tomomi is a single mother. She is excited in experiencing love for the first time in 7 years. Harada Saeko is in conflict with her husband Harada Satoshi about having a child. Mizushima Juri insists on having freewheeling romance. She feels excitement with meeting a woman.
These four women's lives connect and an unexpected story begins.
Shanghai in 30s: An intriguing crime case emerges amidst the bustling city. A beautiful new graduate of police academy, Qin Xiaoman, joins the investigation unit. The famous detective Luo Fei becomes her colleague and neighbour.
Nana and Shota are a newlywed couple and Nana is 15 years older than Shota. Nana works as a designer and Shota works as a gym trainer. They both enjoy mystery. The newlywed couple then move to an apartment and they attend a resident’s meeting there. Nana and Shota become involved in murder cases that take place at the apartment. Residents get murdered one by one. Some residents have a motive, but those suspects have an alibi. Because of this, an arrest has yet to be made.
Tetsu Himokura is a parasitologist. He enjoys researching the lives of parasites at his home laboratory and he barely leaves his home. He also has assistant Haruma Takaie to help him. Tetsu Himokura's right hand is a robotic prosthetic hand. He is very smart, but blunt to others.
Reiko Himekawa is just 27-years-old, but she has already received a promotion to become an assistant police inspector. She leads the 10th murder investigation team at the First Investigation Division of the Tokyo Metropolitan Police Department. Reiko Himekawa is an excellent detective and deals with many difficult cases. She works with Tamotsu Ishikura, Kohei Yuda and Shinji Otsuka on her team. The team then gets Kazuo Kikuta as a new member. Kazuo Kikuta is a detective who does not talk much, but looks to do the right thing.
A story that follows a team of cops as they crack serial cases, fight the crusade against drugs and bring down an international crime syndicate. Special forces agent Guo Yang successfully lures the druglord of Anguo into the country's borders to expedite his capture. However, the shock from the death of Zhu Dui causes him to retire from service. Two years later, undercover cop Zhang Chen learns that a new druglord has entered the country. Zhang Chen approaches Guo Yang and they team up to in a fight against the syndicate.
Iori Igarashi is a talented radiographer who believes the “truth” is definitely captured in CT and MRI images. He and radiologist An Amakasu work at a hospital’s radiology department where they determine the causes of patients’ illnesses and injuries.
A grieving mother is accused of identifying online the man she believes killed her son. But is he really a notorious child murderer or a tragic victim of mistaken identity?
Miyako Arata is newly assigned to the Shinjuku Ward Office's Nighttime Regional Relations Department. Each of Tokyo's 23 wards has one such department, established to mitigate paranormal and occult-related events. Arata's special skill is the understanding of non-human speech, and the story begins with him encountering a youkai at Shinjuku Gyoen park who refers to him as the legendary Heian-era exorcist, Abe no Seimei.
Matilda Stone is a perennially single female detective whose three aunts are well-known crime writers that help her solve whodunit style murders as well as set her up on blind dates.