Great Teacher Onizuka (2012)

Love Forbiddened between Truant Girl and Teacher? Crisis of the Collapse of Class due to Dangerous Revenge... Onizuka Desperate Rescue Drama! (2x9)

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Onizuka realizes that Meiri is acting strangely, and asks Honami why she never comes to class. A year ago, she was in a romantic relationship with her old teacher. She was violently bullied for this incident, and stopped coming to class at all.