@Wind_Blade
Good point, I didn't double check that the "-" sign in the language was in fact minus. I was being a lazy ass and didn't want to translate the Japanese line above as well to make sure of it. Now that I do, the line goes something like
... の物質量へ5000を加算し
Which reads as "Add 5000 to the value of ..."
So TL;DR: my mistake, it should be "+5000"
And yes. That code is shit. But that's what's fun with isekais: it's so bad it's good. The way it's encoded in another alphabet is also very funnily silly, it obviously looks made up on the spot for the sake of having a "magic alphabet".
For argument's sake, the code could be (somewhat) less stupid if that "hand" thing functioned as a global pointer from which you'd retrieve a value.