In the office where Natsume works, the walls of the conference room have been turned into one-way mirrors. It seems that the purpose is to eliminate the feeling of confinement and create an environment that is comfortable to work in an open space. ``Even though you can't see inside from the outside, you can see the outside from inside...'' Natsume, feeling a little excited by the unrealistic space, satisfies his frustration in the conference room in the middle of the night. I didn't know that if it was dark outside the room, I could see through it.