1girl 22/7 22/7_ongaku_no_jikan ? ?? black_necktie blonde_hair blue_hairband blue_ribbon board_eraser chalk chalkboard classroom closed_mouth confused dutch_angle finger_counting from_side game_cg green_eyes hair_ribbon hairband highres holding holding_chalk indoors jacket lens_flare long_sleeves math necktie non-web_source official_art red_jacket ribbon saito_nicole school_uniform shirt short_hair sliding_doors solo sparkle sweatdrop upper_body white_shirt



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