Often times it's not explained, they just do a blanket "it's magic" and refuse to elaborate, which is what I suspect they do here given that levels and stats haven't been mentioned yet.
Just mentioning an example where it does make sense there are a few stories I recall where guns and such...
Well this is really fucking annoying. I'm guessing the purpose of not remembering is to keep the harem hijinks going as he would likely have tried being loyal to Azu otherwise? Doesn't matter I still hate it.
Uh I got bad vibes from this. I think chapter one was enough. Seems like the entire gimmick is the wife dedicating the entirety of her efforts into lying to her husband. Only one direction for the author to continue taking this plot.
I think this might be the first reincarnated as a villain where they didn't give the mc an annoying gimmick. Not sure if I'm forgetting any others that have been dropped.