AR∀GO ―ロンドン市警特殊犯罪捜査官―•

AR∀GO: London Shikei Tokushu Hanzai Sousakan

The story centers around two twins, Arago and Yuan, whose parents were slaughtered by monsters. Years later, the vengeful Arago crosses paths with Yuan, who has since become a police officer, just as blood begins to flow again in the streets of London. (Source: ANN)