"Kagami Kyoko" is the pen name shared by the twin sisters Ono Momiji (played by Nanako Matsushima) and Ono Kaede (played by Nanako Matsushima) who are active in the film and television industry. The elder sister Momiji is introverted and calm, good at writing dialogues, while the younger sister Kaede is extroverted and capable, and good at conception. Over the years, the sisters have helped each other and cooperated closely. The latest drama "Ghost Police Department Koki Sanshiro" based on Furuhata Jinsaburo (played by Masakazu Tamura) has also been well received. However, Momiji is extremely tired and plans to part ways with her sister and write her favorite script. Years of resentment finally prompted her to raise a pistol to her strong sister, and exchanged identities with her, pretending to be "Momiji" and committing suicide. Previously, due to the relationship of the criminal drama, the single Furuhata seemed to have some ambiguity and affection with Kaede, but now he must face this tragic twin murder case... This film is the third part of the New Year's finale.