Nikaido sensei

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She is specially violent against Keima and his remarks on the entertainment value of her lessons. She is an alumni of Maijima academy. She was a member of the champion girls basketball team. Until it got disbanded by the team captain Jun Nagase. A part from being Jun Nagase's senior in high school, she was also her supervisor during her teachers training.it was reveled that she has a connection to at least one of hells royal families.

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She also has magic powers that are strong enough to take down a level 4 spirit. She always appears when things get out of control and the new devils can't handle them. Currently she is trying to infiltrate "Vintage".