Rule 34 Dev - 12_graka 1girl absurdres arrow_(symbol) black_hair blue_cardigan blue_sky blurry blush board_eraser book breasts brown_eyes buttons cardigan cartesian_coordinate_system chalk chalkboard classroom closed_mouth collared_shirt commentary_request cowboy_shot dated day depth_of_field embarrassed equation grey_skirt hand_up highres holding holding_book indoors long_sleeves looking_at_viewer looking_to_the_side math open_book original pleated_skirt school_uniform shadow shirt short_hair sidelocks skirt sky small_breasts solo standing tree wavy_mouth white_shirt white_skirt window|10001588220