Kasumi Serizawa is thrust into a fantastical realm alongside her sisters Miki and Shouko, a world where mahjong tiles serve as currency. Their mission demands strategic mahjong battles to defeat the rabbit ruler governing this land, securing passage back to their own world.

Separately, within an official production, Kasumi appears with her sisters in introductory segments. Departing from the central conflict, these moments explore daily life, focusing on the sisters' personal interests and preferences as they present themselves to the audience.