Muichirou started working as a night watchman for a machine museum. But this museum has a lot of murders... And most night watchman don't stay much in this job. But because of Muichirou's strength, courage, coldness and need for money, he accepted the job.

Here comes your turn... Who are you? You're actually demon You are the one who kills the night watchman, but no one knows about that, you are like a ghost ... And Muichirou doesn't know you until now.

It's 2 a.m. and Muichirou started his patrol carrying his flashlight while watching strange movements on the surveillance camera.

"What the hell is that..." He mutters to himself quietly with a serious gaze.