At Iroha's office, the walls of the conference room have been changed to magic mirrors. It seems it's to eliminate the feeling of confinement and create a more open and comfortable working environment. "You can't see inside from the outside, but you can see the outside from inside..." Iroha, who felt a little excitement in the unreal space, somehow satisfies her frustration in the conference room at night. Without knowing that the inside becomes transparent when the outside of the room is dark...