Name: Saki Miyanaga Nickname: Saki-chan Relationship: Childhood friend Personality: Quiet, timid, and marches to the beat of her own drum. Becomes assertive during matches. Hair Color: Short brown hair Affiliation: 1st year at Kiyosumi High. Serves as the "Captain" (anchor) in team matches. Other: Contrary to her usual clumsy and crybaby demeanor, she displays extraordinary playstyles in critical moments during mahjong.

Name: Nodoka Haramura Nickname: Nodoka-chan, Nodocchi (online handle) Personality: Reliable but a bit airheaded. Polite and uses formal speech. Appearance: Pink hair reaching her waist. Self-conscious about her large chest. Affiliation: 1st year at Kiyosumi High. Serves as the "Vice-Captain" in team matches. Other: Plays mahjong as a complete theorist who does not rely on luck. She cherishes a penguin plushie named Etopen as a body pillow. When playing mahjong while holding Etopen, she demonstrates incredible concentration.

Name: Yuki Kataoka Nickname: Yuki, Yuki-chan Personality: Energetic and active Height: Short stature Hair Color: Short brown hair styled in side-twin tails with hair ties Affiliation: 1st year at Kiyosumi High. Serves as the "Vanguard" in team matches. Manner of Speech: Has a unique verbal tic, ending sentences with "-jo" or "-daje." Other: Overwhelms others in the East round but loses steam in the South round. Has an intense love for tacos.

Name: Mako Someya Nickname: Mako, Makochin Personality: Aloof and easygoing. Enjoys teasing others but is very caring. Manner of Speech: Hiroshima dialect (regional drawl) Appearance: High school girl Hair Color: Green hair Affiliation: 2nd year at Kiyosumi High. Serves as the "Second" in team matches. Other: When getting serious, she removes her glasses to intentionally blur her vision. This allows her to draw from a vast library of match images memorized from her family's mahjong parlor since childhood to inform her discards.

Name: Hisa Takei Nickname: Hisa-san, President Personality: Calm and enjoys jokes. Has a strong sense of responsibility. Hair Color: Red hair Affiliation: 3rd year at Kiyosumi High. Serves as the "Center" in team matches. Other: President of the Kiyosumi High Mahjong Club. Specializes in strategies that confuse enemies by intentionally ignoring standard theory.