A secret investigation was launched by the Special Internal Affairs Investigation Team. It was a whistleblower complaint that there was an insider of the female body torture research institute in the bureau. The members who are feared by everyone and called 'ghosts' are hidden, and they sneak into various departments under the surface and conduct secret investigations. Okajima Ami (Kuroki Ikumi), a rookie investigator in her second year with the Criminal Investigation Headquarters, was selected as one of the members to hide her identity as a 'ghost' and replace Miyabi Kagurazaka. assigned to.
