I was going to be really sad if those emails were from his friends they were asking where he went or some thing, and said it’s just the news in the other world.
@Acidroach
Yeah, it's explained a bit better there, how he was simply yoinked from what was going to alter his mind a bit.
The news and letters were clearer as well: His obituary and funeral and all. The one that interfered with the 'boss summon' was content enough with having him just not be a new boss as that was in and of itself the main success, although
it gives him a way to use the dungeon teleports later after realizing Schwartz wants to go fuck up other dungeons, thus helping it with its work.
So I guess it’s gonna go about a few chapters of MC being aimless and depressed, someone (Ashley/ female guild mates) saying something that resonates with him, snapping him out of it. Then begins his journey to find a way to confront the god that brought him there and probably kill it, but with guns.