Are these feelings and occurrences a result of the souls of the buildings themselves, as Akira suggests? Not an extra character, but a crow! The isekai fantasy story centers on a man who dies due to overwork, a phenomenon that has unfortunately become a known problem in Japan.
She is into everything pop culture, including anime and manga.
Just before dying, the man thought that if he was reincarnated, he would want to live the lazy life of a rich man's dog.
When he woke up, he found that a nomadic tribe of elves took him in.