Are Japanese authors at the point they can't even write something plot-wise that hasn't been done before? I mean like done 100 or 1000 times before? This writing is at the level of doujinshis, and even then, some doujinshi have better writing.
I'm not saying I expect a fucking Lord of the Rings level of writing when we read these stories, but my god, at least have the chick bite the "hero's" dick off or something to change it up a little. I mean at least give us something that separates it from the other stories just like this. Renya being an old man in a young body is not enough to change how generic this is.
IDK, I get we read these stories because of its wish-fulfillment and to just chill for a few minutes while reading a chapter, but when I can predict what will happen when these releases are months apart from each other and I completely forget about the plot, just to come back and see where it's going within a few pages, that's not very good, IMO.
I WILL ADMIT, there are far worse versions of this out there and this isn't so bad it's unreadable, but still, I feel as though it deserves all the criticism it's getting.