"Yeah. There's a ward against something placed there. It seems like another magician was meddling with things. Of course, the target wasn't Ryougi Shiki. If it was, they wouldn't have held off for two years."

It was a whopper of a lie, but the confident way in which she spoke meant he didn't suspect a thing.

"... Uhm, a ward. That's like the second floor of this building, isn't it?"

"Yep. A ward is something of different levels which isolates a specified area. They range from ones that really create a wall to ones that cover the target area with an invisible barrier. The highest ranking wards are a form of subliminal coercion that goes, "nothing has been done but no one approaches". It's the same as this building. If you put in place a suggestion like "anyone who does not have a reason to come here will not be conscious of this place", a ward will be formed which will continue to exist without anyone noticing. A ward that just mimics another world and makes people realize that something is wrong is the worst of the worst."

A strangeness which prevents you from noticing strangeness - that is her rule of vacancy. A ward which everyone ignores and passes although it's on the map. A world where a pre-eminent magician lives appears to be just like any other neighboring house.

But, that ward, this new employee unconsciously broke it. This building which he shouldn't have been able to find unless he knew Aozaki Touko, he found too easily.

... Well, that is also the reason she hired him.

Kara no Kyoukai: The Garden of Sinners, Volume 4, Chapter 2