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I just realized that Suisei's art for the solo live is her in a princess costume (Cinderella) and her art in the album is her with a prince-like costume (with the shoulder cape and all). These were probably themed from the lyrics of Stellar Stellar where she says that she's not Cinderella but the prince who saves the day.
Has she talked about this? I'm an EOP who only listens to cute suisounds during zatsu.