Yeah my B on that one. I doublechecked and it's DLsoft, not DLsite https://dlsoft.dmm.co.jp/en/
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For the record it's machine translated weirdly on the English version of the site so if you find "a carp cutlet" you've got it right.
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A VPN, in a nutshell, masks your IP address and can let you use an IP address from another country to get around national restrictions. I use NordVPN personally.
Okay now that I found out the reason why rotation wasn't working, I'll admit that I'm actually an stupid. So the problem is, I'm using Barrier (a program which basically let you use a single keyboard and mouse to control another computer) to control my laptop from my desktop (I had to play on my laptop because my desktop doesn't have a graphics card). For some reason when I try rotating it doesn't work but everything else was working just fine. After messing around I tried to move the camera using my laptop trackpad instead and it worked!
I'll leave this here if anyone is having the same problem as me but I guess no one is having the same setup as mine lol
TL;DR: Barrier doesn't work when I try to rotate with my mouse so I use my laptop trackpad and it worked, maybe I'll get a seperate mouse later.