Miike, Shin, Masa and Yuri participate in an experiment for 100 thousand yen. They have been asked to stay in a dark room for 10 minutes, where there is nothing else than a table with a lamp and 4 envelopes marked with their names. From the moment they will open the envelopes, this apparently absurd situation will turn into an increasing suspense story. After all, this experiment was probably not that simple..