1girl absurdres black_footwear black_hair black_sailor_collar black_serafuku black_shirt black_skirt black_socks blush brown_eyes closed_mouth hands_up head_tilt highres knees_up loafers looking_at_viewer matsunaga_kouyou nose_blush original own_hands_together pleated_skirt sailor_collar school_uniform serafuku shirt shoes sitting sitting_on_stairs skirt smile socks solo stairs