Hope they continue their journey soon, I'm eager to find out what is the significance of Aureole(see chapter 7), the 'place where souls gather', the center of soul research, and the place which people, at least previously, called 'the Heaven', and what's its connection to it now being the very center of the Demon Realm, with the Demon King castle now in that very place. Obviously there's a connection, but what exactly happened back there?