An anonymous letter is delivered to the Tokyo Metropolitan Police Department. The letter states that a criminal of a murder case will appear at the countdown party Masquerade Night that will be held at Hotel Cortesia Tokyo. Detective Kosuke Nitta must go undercover and work again at the Hotel Cortesia Tokyo. There, he meets Naomi Yamagishi, who works as a concierge. Without any information about the criminal, except that the person will be in attendance, Detective Kosuke Nitta works feverishly to find the criminal among the 500 attendees.
Kida and Makoto grew up together because they have it in common that they don't have parents. And a transfer student, Yotchi, also gets along with them because she has a similar background, which is that they come from not such a good home environment. They spent their school life supporting each other. But, at the age of 20, Yotchi disappeared. Then Lisa, the daughter of a politician and a top model, appears in front of the two men. Makoto takes an unusual romantic interest in Lisa, who lives in a different world from them, and asked her out to dinner, but she does not take him up on it at all. Kida warns Makoto to give up on her because they live in different worlds, but Makoto quits his job and vanishes without a trace.
Prosecutor Komazuki Nao from the Yokohama District Public Prosecutors Office’s Minato Mirai branch and lawyer Tsutaya Madoka (Matsu Takako) from the law firm Yokohama Gold dated for seven years since the time they were in school. Even after they broke up, they have continued to be hopelessly linked to each other.
To get revenge on her ex-boyfriend and to help revive her late mother's tennis table club, a table tennis prodigy decides to take part in a mixed doubles table tennis tournament.
