calendar christmas pantsu petite_cerisier sakura_hanpen shimapan

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Her hair's wrong to be Mai, she needs the twin "antenna" ahoge. Plus she generally does the full transformation when she turns into a Santa, and her hair's blond then, and her breasts are much larger. (´・ω・`)
To me it looks likes Subaru Mikage from Comic Party. But I'm not sure the ear is off a little and I'm not 100%.