Kenzo Mori, a Tokyo detective, travels to
London in search of his presumed deceased brother Yuto, who is accused of brutally killing the nephew of a Yakuza member, which as a result, threatens to start a gang war. As Kenzo attempts to navigate the unfamiliar territory of London to uncover whether his brother is guilty or indeed alive, he becomes acquainted with DC Sarah Weitzmann of the Metropolitan Police and Rodney Yamaguchi, a half-Japanese, half-British sex worker. However, Kenzo's investigation brings him into contact with dangerous elements of London’s corrupt criminal underworld.