Kuromajo-san ga Tooru!!

Ms. Black Witch's Class Visit (1x16)

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On Class Observation day, Gyubid disguises herself as Chiyoko's mother in order to investigate her teacher, Mr. Matsuoka, who's been possessed by a demon. After exorcising Matsuoka, they discover the culprit to be Akuma Joe, who was accidentally swallowed by Matsuoka.