Yui, a female employee, has returned from her honeymoon. Yui works overtime to clear up the backlog of work, so Abe, the manager, helps her. Then, late at night, as they are carrying the cleared documents to the archive, there is a sudden power outage, and the electronic lock on the archive is locked, trapping the two of them in. As time passes, Yui gradually becomes sleepy. Seeing this, Abe loses his senses and pushes Yui down... After that, for some reason, the two of them start to be locked in a closed room whenever something happens...