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annin_douhu kobayakawa_sae mizumoto_yukari pantyhose sakuma_mayu seifuku the_idolm@ster the_idolm@ster_cinderella_girls the_idolm@ster_cinderella_girls_starlight_stage

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The artist(s) of official illustration are not credited. Could be kurogoma, who did lots of illustrations for Cinderella Girls.

Also, I suspect this image is upscaled, there are plenty of dithering artifacts.
Very well thanks for the feedback @fireattack!