Female employee Yui returned from her honeymoon. To catch up on piled-up work, Yui decided to stay late. Department head Abe decided to help her. Then, in the dead of night, as they were moving the sorted documents to the storage room, the power suddenly went out and the electronic lock on the storage room engaged, trapping them inside. As time passed, Yui began to feel sleepy. Seeing this, Abe lost his reason and pushed Yui down… From then on, for some reason, they kept getting trapped in confined spaces together…
