I'm utterly confused. This is complete madness. As expected from Saishoo, I guess.
I didn't find the fishing rod.
I didn't manage to swap books between 2 shelves (I'm assuming a bug), thus making it impossible to sort them.
I didn't get anything out of the QR code.
The only base64 I managed to get anything out of is the one from the itch.io game page and not the one you're told to decode. Plus, there's text telling you that the link was wrong.
I also had the (first) game softlock a couple times.