Detective Conan: Case Closed (Meitantei Konan)

Detective Conan: Case Closed (Meitantei Konan) synopsis: Kudo subsequently crosses paths with Anita Hailey, a new elementary school transfer student who, in truth, is Ai Haibara, a former operative of the enigmatic Black Organization known by the code name "Sherry." She is also the mastermind behind the experimental drug that reduced him in stature. Having consumed the same concoction to escape the organization's clutches, she eventually becomes a member of the Junior Detectives. In a rare confrontation with the Black Organization, Conan aids the FBI in embedding a CIA agent named Kir as an undercover spy within the organization's ranks. (Source: Mangamonster.net)