Is this a different manga? I'm pretty sure it has a similar title, but the difference it was on a phone and the ones he has contact with are like sun wukong and other famous known deities?
I know this message was from a long time ago but if you still want to read it then, I'll reply. Izakaya Nobu did not vanished, it's the other stores that he had mentioned that did, meaning that there were others before Nobu and Gen that had come and gone to this world and only a few individuals...