1girl, o, amiya_(arknights), animal_ears, arknights, blue_eyes, blue_one-piece_swimsuit, brown_hair, covered_navel, cowboy_shot, flat_chest, kotoha_(kotoha65), long_hair, looking_at_viewer, one-piece_swimsuit, parted_lips, rabbit_ears, sailor_collar, school_swimsuit, simple_background, solo, swimsuit