A prequel to Kakegurui is set a year before the main story's events, and is centered around Saotome Mary.
Saotome, a bright young girl born into an ordinary family, has passed her transfer examinations and has started to attend Hyakkaou Private Academy. It's an elite school with an exquisite twist - gambling has become a central part of the school's rules. Saotome adapts quickly to the school's outlandish system, and soon succumbs to the gambling mania that she comes to be known for.
|Chapter 1: The girl called Saotome Mary||August 30, 2016|
|Published||Sep 19, 2015 to ?|
|Serialization||Gangan Joker (Square Enix)|
|Last Updated||July 22, 2017|
|Other names||狂赌之渊 双, Kakegurui Twin, Kakegurui Futago (Twin), Kakegurui Futago (Twins), Kakegurui Futago Twins, 賭ケグルイ 双－ツイン－|