@chojinra
Pretty much all I wanted to say, and more on top of it.
This has to be the first isekai I had have read, that so bluntly emphasizes how much it is not really isekai. It's just tagged that way to draw in the existing fanbase.
Everything about how the MC behaves, shows that he is truly just a clueless kid, not someone who lived before.
Also, it is really confusing as to why the MC was written to be so whiny. At one point he says: "I hate being a half-human, because it makes me weak", but then he says: "I don't want to become strong, why would I need to be?"
His shitty and stupid attitude is such a low-hanging fruit, that it cannot possibly be by accident or incompetence by the author. But I have no idea why would anyone think THIS MC is a good idea.
@mommunism
I actually recall an isekai / "gamified" manga that was even worse than this one, solely because the MC was not even happy with his own situation. Even if this MC is a stupid scumbag, and the plot is B-rated, at least it knows what it is.
That other manga, was about a guy who was incredibly lazy, and wanted a simple life, but he was entitled to receive the "jobs" of either a demon-king, hero, sage...Or slave-trader. And he picked the last one, because "it seemed like the least to be a drag".
I.E: The plot would be non-existent, truly. The MC does not even want to be in the story, since he is unhappy with every choice he received.