She served as minister of education but stepped down shortly after Nasa and Tsukasa got married. Health concerns were her stated reason, and she's suggested age might keep her out of politics going forward. That said, she clearly still wielded serious influence—she had no trouble tracking down Tsukasa's location even when she was staying at Nasa's place.
Her power shows up in other ways too. In chapter 70, when Nasa and Tsukasa visit a hot spring resort, she conveniently "gets lost" in the massive facility and needs Nasa to escort her back to her room, where Tsukasa reveals she's actually her grandaunt.
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