Harold Berkeley manages a detective agency in Brad City. Operating under the alias Lily, Rikka Isurugi trains as a detective under his supervision. This role within his agency provides Rikka with professional structure and investigative resources. Harold's agency facilitates her efforts to gather intelligence on those responsible for her family's attack. His primary function is overseeing her detective work throughout her pursuit of justice. The character operates within the urban setting central to the narrative's events.