Ouroboros (ウロボロス〜この愛こそ、正義。) is a Japanese drama series which tells the story about two men, one a detective and another a member of the yakuza, who seek to find the truth about a murder that happened twenty years ago which was clamped down by the police.
Famous for having the highest arrest rate in the second bureau of the Tokyo Police department, he seems to be a promising young detective with a keen sense of justice.
These two men seemingly have nothing in common but are currently moving forward powered by the same desire: to take revenge on the "man with the gold watch" who suppressed the investigation and their statements about witnessing the murder of their teacher, Yuiko-sensei, who was more of an older sister/mother figure to them in the orphanage.
A murder disguised as suicide in the opening episode of the series paves way for the expose of the rampant corruption present in the higher tiers of the police department.
Also, they uncover the vestiges of truth about the Kintokei-gumi, the "men with the golden watch" who seemingly had more sinister points of interest about the establishment of Mahoroba Orphanage where the protagonists lived until that fateful murder occurred.