1girl, arona_(blue_archive), bikini, black_bikini, blue_archive, blue_eyes, blue_hair, bow_hairband, breasts, collarbone, frilled_bikini, frills, hairband, halo, looking_at_viewer, lying, moruhinesan, navel, on_back, open_mouth, short_hair, small_breasts, solo, stomach, swimsuit, white_hairband