"Temptation." Yato said, after a moment's thought. "The living are meant to keep living and the boundary is to keep their focus on that, not the afterlife. Too much contact with the Far Shore can lure a human towards it until they give up on living their lives."

He tilted his head slightly when he looked at her. "I'm not sure why they wouldn't? No matter where we are, the living still need to live."