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bejad007
The short hand answer to your question is:
Simply, it's a dumbed-down, "abridged" version of the LN.
The diary style works great written out, as even embattled action seems like he's describing it in his log. But here, makes it kind of janky.
But, well, I wouldn't trade off waving spider demons for the world. And if this, somehow, ever gets animated, they better damn well have those spiders waving.