Dropped this game really quick. You walk awfully slow, even if the option is called "fast", and you have to endure it while finding and cleaning up spots around the school to earn money. Going further, while it is about prostitution it still requires you to have credit for each single girl, not even global credit that could be earned with all girls, so that also plays into the slow category for which you most likely need multiple playthroughs (though that anyway since each girl has their own ending, but the keyword being slow).
Edit: I mean, even if you had the money and don't need to find spots to clean up, walking that slow you still have to find each girl, or at least those of interest.