Miki Serizawa is one of three sisters, alongside Kasumi and Shouko, skilled in mahjong. Whisked away to an alternate realm where mahjong tiles serve as the primary currency, the trio faces a unique challenge: they must engage in high-stakes mahjong matches against Rabijan, the rabbit sovereign ruling this land. Successfully defeating Rabijan in this tile-based contest represents their sole chance to return to their original world.