Watching established characters stab each other in the back, scheme, and even cheat their way to victory as Yumeko is able to stop them nearly every single time is just as satisfying as watching Sailor Moon defeat the bad guys each episode. You know what the end result will ultimately be, but it's an addictive rush the whole way there. This tension (as well as the sheer absurdity of each wager) is literally expressed with dark colors, sinister music, and not least of which the absolutely terrifying expressions that etch themselves across characters' faces. I can guarantee you've never seen these menacing, unhinged faces in another anime, and Kakegurui is all the better for it. If you thought Higurashi no Naku Koro ni (When They Cry) perfected the art of the "nightmare face," you haven't seen anything yet.
A sweet smile can melt into a psychotic grin with exaggerated features in a single moment. Before you can even blink, the typically demure Yumeko is snarling in a low voice with an eerie crimson glint in her eye when speaking to someone who's wronged her. Visually, it's truly spectacular to behold. The whole of Kakegurui is beautifully animated in the first place, so seeing these awful, twisted expressions feels disturbing and out of place in the best kind of way.
But beyond its excellent animation and ghoulish faces, one of the most intriguing parts of Kakegurui is its predominantly female cast and how it handles their interactions. This show is comprised of mostly women who aren't afraid to identify what they want and go out and get it, no matter the consequences. That isn't particularly rare for anime, but it's always nice when a man or some sort of romantic conquest isn't at stake. In the first season, it appeared that male protagonist Ryota would be the main focus, but the show quickly and completely flipped the script so that Yumeko became the crux of the show. Instead, quite surprisingly, Ryota faded into the background into a support role.