the first 2 chapters felt obnoxious with how much over-thinking the protagonist was doing for everything. This isn't a LN, you can just draw the environment instead of having the protagonist go "huh, there's a door, I didn't notice. Now that I think of it, the walls are made of stone."
but this chapter, about trying to convey a foreign language, was actually interesting! I'd like to see it develop like this.
although either way, I'm not sure there's any point to the "I don't remember anything" gimmick. If you're in a foreign land and don't know the language or the culture, why does it matter if you can remember your own or not? Besides, he seems to remember everything that's convenient, anyway.