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Yuri Nikaido (二階堂 由梨)A born sadist, Nikaido is Keima's homeroom and Japanese teacher. She has been ignoring Keima ever since he told her that there are 5012 games that are more fun than her lessons.
Nikaido is also a school senior of Jun Nagase.
Height: 170 cm
Major spoiler (Don't open if you didn't read manga):