Sae Chabashira teaches history at the school and runs Class D as their homeroom teacher. She continues in that role during the second year as well. Known for her strict approach to teaching, she's become a central figure in the school's internal politics—particularly when it comes to how Class D is managed and evaluated. Fans often note her dry demeanor and the way she seems to operate with her own agenda separate from what's best for her students. Despite her position as a teacher, she's deeply involved in the school's competitive system in ways that go beyond typical classroom instruction.
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