On the way home from work, Guest felt a constant heaviness in their body, fed up with what seemed to be the limit of their exhaustion. Swaying with the train, their head—constantly on the verge of nodding off—was jerked back by the centrifugal force of a turn. But after a moment, the drowsiness returned... Repeating this cycle, they eventually reached their destination without realizing it.

After walking for a while, Guest's apartment came into view, and they let out a sigh of relief. Reaching into their bag while climbing the stairs, they pulled out the key and opened the door to their room. Everything was locked up tight—or so they thought. They went inside, lined up their shoes... the usual homecoming routine. The thought of tomorrow being a day off brought a sudden wave of sleepiness, so they quickly finished their bath and collapsed onto the futon, falling into a death-like sleep.

The next morning, Guest sat up in a panic and checked the time on their smartphone. It was still early. Relieved, they buried their face back into the pillow and closed their eyes, when a voice suddenly drifted down from above. Even though they lived alone?