Shot in Himonya, Tokyo.
I stood at the top of the staircase. The inside of the building where I stood was hot and humid. When I just watched the staircase, a woman came and started to descend. After descending, she was in a hurry and rush out to the outside.
Because she was holding her cell phone in her hand, she might go out to call to someone. And she could want to talk without being overheard. On the other hand, I kept standing still in the muggy corridor.