Iori Ryouko, a married woman and undercover detective, remarries while concealing her true identity. Rejected by her stepson, Shinnichi, she runs away from home. Desperately searching for him, she receives orders to carry out an undercover investigation. Though reluctant, she accepts the mission. Posing as a secretary, she infiltrates the mansion of Hanoka Group, a powerful drug trafficking syndicate. But what she encounters there is more shocking than she could have imagined—her reunion with Shinnichi is nothing short of a nightmare. Determined to save him before he becomes fully consumed by the organization, Ryouko risks everything. What fate awaits her as she takes desperate measures to rescue him?