Three murder cases take place in Tokyo. Numbers are left at the murder scenes, possibly hinting at where the next murder will take place. An investigation begins of the serial killer and Detective Kosuke Nitta works on the case. He believes the next murder will take place at Hotel Koruteshia Tokyo. To catch the killer, Kosuke Nitta goes undercover and begins working at the front desk of the hotel. Naomi Yamagishi works at the front desk of Hotel Koruteshia Tokyo. She is selected to train Kosuke Nitta for his front desk job, but they can't get along. Kosuke Nitta is focused on catching the killer, but Naomi Yamagishi prioritizes the safety of the guests. As they begin to understand each others differences, they also begin to build a trust between each other. Who is the murderer?
木村拓哉
as Kosuke Nitta
長澤まさみ
as Naomi Yamagishi
松たか子
as Yoko Katagiri
小日向文世
as Kazuhiko Nose
梶原善
as Masaharu Motomiya
菜々緒
as Eriko Yasuno
泉澤祐希
as Takuma Sekine
東根作寿英
as Akihiro Kuga
石川恋
as Mika Kawamoto
濱田岳
as Takahiko Ayabe
前田敦子
as Keiko Takayama
笹野高史
as Koichi Ono
