Mahjong was the only thing Nikaido Aki knew while growing up. Her parents ran a Mahjong shop where people gathered to play, making it a pleasant time for Aki, her older sister Rumi, and their family. However, when their mother suddenly left, their father was forced to close the shop and left Aki and Rumi in the care of relatives. With no clear goal in life and unsure whether she even wants to continue to high school, Aki must figure out what she wants from her life.