Synopsis

10 men and women are called to Natural Island Hotel on the isolated island Heitaijima off Yachijojima by the owner Nanao Shin. They take the dinner that has been prepared while filled with a mix of expectation and anxiety about what is going to happen and why they have been invited to this island. Then they suddenly start to hear a mysterious voice reveal their past crimes. As the 10 of them go through past incidents in their mind, one of the invited guests is murdered before their eyes. That seems to be the catalyst for the murder of another guest and then yet another. Several days after the invited guests came to Heitaijima, police head over to the island following the report of murders. They discover 10 murdered bodies on this big “locked room”. Who is the murderer and why did these 10 people have to be gathered and killed?