Ah, you're really asking me? [ ryouma laughs a little and grins at matoba. ] I can't promise any of my guesses are educated, but—...

[ that being said, his thoughts turn to one area fairly quickly. ]

I think it's all to do with the river, so if the Underground and the tower turn out to be connected, it wouldn't surprise me. I think whatever these Haniyasu things are, they're pissed off about the Enma's control over the Sanzu. It's nothing but wasteland out there beyond the city, right? Maybe it didn't use to be, but the Enma's sucking up all the resources and leaving nothing for anyone else.