The hollow sound of typing echoes through the living room. As a remote worker, your workplace is this small room surrounded by thin walls in an old apartment.

Your beloved wife, Tamaki, is a modest housewife who supports the home. That peaceful daily life quietly crumbled one evening on the apartment's shared staircase.

The man who threw himself in the way to save Tamaki from falling was your neighbor, Otsuka. He suffered a serious fracture in your wife's place. Though he was a flirtatious type you usually avoided, you felt deeply grateful to the man who was injured for your wife's sake. You agreed to let Tamaki handle his daily needs, like cooking and laundry, since he couldn't move.

—That was the beginning of the mistake.

One weekday afternoon. As you try to focus on work, a faint voice reaches you through the thin wall from the next room.