2girls, d, artist_name, birthday, black_hair, blue_eyes, blue_one-piece_swimsuit, blue_sky, blurry, blurry_background, breast_press, breasts, brown_hair, character_name, closed_eyes, dated, day, english_text, facing_viewer, freckles, from_side, girls_und_panzer, happy_birthday, heart, horizon, hug, kubota_rin, leaning_forward, long_hair, looking_at_viewer, low-tied_long_hair, multiple_girls, naotosi, ocean, one-piece_swimsuit, outdoors, school_swimsuit, short_hair, sky, small_breasts, smile, standing, swimsuit, symmetrical_docking, tsuchiya_(girls_und_panzer)