Yu Kuroha, a female detective from the Kanagawa PD Mobile Unit, discovers bodies of fourteen men and women frozen to death in a rental container. When the wills of the dead persons were found, her boss decides to treat the case as a simple group suicide. But Kuroha persists that they have to find the leader who assisted this mass murder. She finds out that the number of wills outnumbers the bodies by one. One person did not commit suicide…! Kuroha is a skilled sniper but also a delicate woman who takes refuge in cyberspace. The drama portrays her gaining maturity as a person and a detective by solving the mystery of a group suicide by standing against the mastermind of the case.