1girl, arms_behind_head, arms_up, blue_neckerchief, blue_sailor_collar, blue_skirt, blush, brown_hair, closed_mouth, hibike!_euphonium, kitauji_high_school_uniform, kotomozou, long_hair, looking_at_viewer, nakagawa_natsuki, neckerchief, pleated_skirt, ponytail, purple_eyes, sailor_collar, school_uniform, serafuku, shirt, shoes, short_sleeves, simple_background, skirt, smile, socks, solo, standing, uniform, uwabaki, white_background, white_footwear, white_shirt, white_socks