Perhaps so, but there are those that a haunted through different reason. Like what if someone had regrets with unfinished business or just protecting the house from intruders.

[ The smell of musk, dust, and whatever has been growing here does seem to be prevalent. Suddenly a mask of his own does appear in his hands thanks to his treasury which he will put on as well as offering another to Ai. Look who is all prepared, Ai! ]

I've got you covered. And some bandages and other things should anything happen! Anyway... lets proceed with the exploration, shall we?

... wow, it is hard to breathe in these. Be careful not to hyperventilate yourself.