It certainly felt like they were going the right direction. It didn't occur to Reigen to check or to question his own certainty (or Mob's, for that matter) on this. He just kept walking until he was staring into another room. There was more natural light than ever filtering through the shoji screens here. That wasn't what immediately drew his attention though. No, it were the wooden bookshelves with their shelves wide open lining the walls.

Reigen mouthed something to himself and gravitated towards the west-facing wall in particular where the books were still neatly mounted. A scroll had rolled out to display a long poem and he started reading right from the top.