Have a question what can you do with f10 what is that with rand rand
Those are variables within the game, and there's more than what's in the screenshot, and changing those variable, affects certain aspects of the game.
like, inventory, relationship points, money, outfit score, etc...
you just have to know which variable effects what. unfortunately playing with these variable, if you don't know what they do or overuse them, could very easily break the game.
That's why I always recommend that you stick only inventory, money, and to a certain extent relationship points and outfit score as those can also break the game if overused.
As for what "rand" my guess is they control certain random scenes. But it's only a guess.