WHOA!
I realized too late that this is the shounen comedic romance with an isekai spin-off.
The spin-off's start would be irritating if you don't take it as purely gag.
There's lots of bad manga that just isn't executed well, or is lazily made, or just has a dumb author, but stuff like this is different. There are just so many small things that make it seem like the artist was abused as a child or something. The very awkward guro humor wouldn't be that weird in isolation, but the art style and the ways the punchlines land are just super uncomfortable.
First, this girl is too stupid... second, she's not even a tsundere... she barely has tsundere moments... she doesn't have enough tsun or dere moments... just stupid... to the point that I hope that the MC doesn't get with her....
It's at least better then Aho Girl. I find her more funnier (Though I do feel a bit annoyed) I thought she was clumsy but I was wrong. The mentality of a kid.
Honestly I love Kana a lot better. She shows a unique charm and proper growth of a childhood friend.