I know it's been quite long since the translation, but there's an error on page 21.
It's "A normal person at 20" not "going beyond what a normal person can do".
The illustration already depicted it that way too.
Ditto page 22.
The world forbids a confession until the end and will go out of its wait to stop it.
I wouldn't even be surprised if he gets isekai-ed by truck-kun just when he wants to tell it to her face to face.
I went and checked around some Japanese reviews on why there are two mangas and what are the difference.
The gist of it is:
Nobody knows why there are two. The Authors and Publishers are keeping mum about it.
If you have read the LN before and just want to see quality art and expressions, go...