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Third-year of Kiyosumi High School Mahjong Club, Hisa Takei takes the position of lieutenant in the Mahjong team tournament. Talented as she is, Hisa is both the president of the Mahjong Club and the president of the student congress. When playing Mahjong, she prefers to use counterintuitive strategies relying on "bad waits" that would be unimaginable to most players. With such tactics, her adversaries are easily fooled by her.