1girl, adapted_costume, aoba_(kancolle), artist_name, breasts, closed_eyes, gakky, kantai_collection, messy_hair, neckerchief, one-hour_drawing_challenge, ponytail, purple_hair, purple_sailor_collar, sailor_collar, school_uniform, serafuku, shirt, short_hair, sleeveless, sleeveless_shirt, solo, stretching, upper_body, yellow_neckerchief