1girl, ahoge, arknights, ball, beachball, bikini, black_eyes, black_hair, breasts, goggles, goggles_around_neck, holding, holding_ball, holding_beachball, jacket, jacket_over_swimsuit, kochiya_(gothope), la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), looking_at_viewer, mouth_hold, off_shoulder, official_alternate_costume, open_clothes, open_jacket, partially_submerged, simple_background, small_breasts, solo, swimsuit, wading, water, white_background, white_bikini, white_jacket