2girls, alternate_costume, aqua_eyes, bare_arms, bare_shoulders, beach, bikini, black_hair, blush, breasts, brown_eyes, brown_hair, closed_mouth, day, hand_on_own_hip, hands_on_own_hips, isuzu_(kancolle), kantai_collection, long_hair, looking_at_viewer, medium_breasts, multiple_girls, navel, ocean, open_mouth, outdoors, serious, side-tie_bikini_bottom, simple_background, small_breasts, smile, stomach, swimsuit, takanashi_kei_(hitsujikan), thighs, twintails, water, zuikaku_(kancolle)