Akio Fukamachi

Bent on revenge, a traumatized ex-police officer must infiltrate a yakuza organization by befriending one of the group's most unhinged members.

When Kanako, a model daughter and a brilliant student, disappears, her mother asks her ex-husband, a violent former policeman, to find her. As his investigation progresses, his idealized image of Kanako cracks: the girl hides a dark life that her father can not even imagine.

Eiko Yagami is a "Marubo", a unit of Ueno Central Police Station's Organized Crime Division which deals directly with organized gangs to try and keep the peace. However, Eiko has some sidelines: she's a moneylender to her fellow police officers without charging interest in return for information and is also willing to do the odd side job for those on the criminal side for the money. One day, Kasumi, who is the daughter of Senma-gumi gang's leader, is found stabbed to death. As this threatens to pit gang against gang, Eiko and the police have to hurry and find her killer.

An organized crime detective investigating her husband's mysterious death is drawn into a brutal gang war, where dangerous alliances blur the line between justice and revenge.