Miki stands as one of the three central protagonists, a confident and experienced mahjong player. She enters the world of the game alongside Kasumi and Shōko, two young women of contrasting backgrounds and personalities. Where Miki possesses self-assurance and skill, Kasumi and Shōko approach as relative novices, compelled to learn the game's rules and intricate strategies.

Their journey unfolds through a series of mahjong matches, each one a demanding test of strategy that serves as a crucible for personal growth. Amidst the intense competition, the characters hone their abilities and come to recognize their own unique strengths and weaknesses. Beyond the play for points, their story is also defined by moments of friendship and mutual respect, which steadily deepen the bonds between them.