What broke the camel’s back for me was the beginning of volume 2. He ends up finding out that he has no way to go back and he breaks down. Pretty normal, is it not? Weeeeeeeeeeeeeeeeell, that’s okay, because he’s fine again soon enough and back to mindlessly doing quests.
The very next chapter he is forced to accept a quest that screams out DANGER! DANGER! DANGER!, because he has apparently checked his balls in at the counter. Of course, this quest is just a way to forcefully move the plot towards the direction that ongoingwhy mentioned, and he is like a fish in water in his new environment that I’m sure will cause him to inexplicably become involved in some world changing b.s.