Kanae's husband disappeared without a trace while on a union trip. Though usually headstrong and independent, the woman becomes plagued with worry over what happened to him, and is unable to move on with her life. Thus, Kanae decides to hire a private investigator, and keeps running the public bathhouse to the best of her abilities. As he tries to figure out the truth about her husband, Kanae must deal with the stress from a work-intensive job, meddlesome neighbors, and recurring nightmares in which she is drowning.
Taken in by the yakuza at a young age, Kenji swears allegiance to his old-school boss, pledging to adhere to the family code amid ever-changing times.
Shota came to Tokyo to become an actor but has a side hustle in petty crime. On a trip back to his hometown in Wakayama he meets Takara, who is being assaulted by her father just sprung from prison. Soon they pair up and hit the road to escape.
Eiji Arima is a veteran detective who is about to retire. Shoichi Sera is a young lawyer and Misuzu Haruna is a prosecutor. These three people belong to the Gohan Taisakushitsu ("Misjudgment Countermeasure Office’". Their job is to re-examine death-row convictions and check to see if anyone was falsely convicted.
"Ouroboros" is an ancient symbol that depicts a snake eating its own tail - meaning infinity. Based on a popular comic, a clumsy detective and a cool gang stand up to true evil. Ikuo and Tatsuya grew up in a children's orphanage together. When their favorite teacher, Yuiko, is murdered, a policeman wearing a gold watch covers up the incident. Ikuo and Tatsuya promise each other to avenge their teacher someday. Twenty years later, Ikuo is a detective in Shinjuku second police station investigating various cases with elite detective - Mizuki, while smart and handsome Tatsuya has become one of the top members of a gang group.