The wife of a tycoon, Suomi, suddenly disappears. Upon learning of her disappearance, assembled at the mansion where her husband lives are five men who have loved her. But they each describe their version of "Suomi" very differently, both in appearance and personality. So, who exactly is the real Suomi?

A serial killer leaves a GPS code of his next target with each victim — this time Hotel Cortesia Tokyo. A detective goes undercover as hotel staff — haircut, manners etc.

The film opens as a jury is about to acquit a defendant -- a bar hostess who pushed her ex-husband path of an oncoming truck, supposedly in self-defense. Just as everyone seems to be in agreement over the woman's innocence, one juror voices second thoughts.

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.