Since Kakegurui Twin comes from the same mind as the original Kakegurui, and the anime is also produced by the same studio, there are many similarities between the prequel and the original series. From weird gambling games to predominantly jazzy theme songs, fans of the original Kakegurui can quickly notice the similarities between the two series.
That being said, just the simple fact that the prequel featured a different main character immediately changed the whole dynamic of the story. Because you see, Yumeko Jabami from the original Kakegurui is extremely self-confident, smart and highly addicted to gambling. Some might even say that she can only really feel alive when she is in the middle of a high-stakes gamble.
Mary Saotome, on the other hand, is not like that. Sure, she may be as smart and astute as Yumeko, but when she first came to Hayakou Private Academy, she didn’t enjoy gambling at all. After all, money is not something that comes easy for his family. The only reason he got admission in this elite school is because he is smart enough to get full scholarship.
That’s why she is shocked and stressed out when she suddenly finds herself gambling an absurd amount of money that she doesn’t have. However, Mary is determined to be the best at this school, so even if she has to fight her way to the top and be filled with anxiety and despair all the time, she will do so. These distinctive personalities between Yumeko and Marie are the reason why Kakegurui Twin has its own unique flavor that differs from the original.