1girl, d, arm_support, beach, bikini, blue_sky, bracelet, breasts, cai_geng, cloud, collarbone, day, flower, green_hair, hair_flower, hair_ornament, hairband, hibiscus, horizon, idolmaster, jewelry, legs_together, looking_at_viewer, medium_breasts, navel, necklace, ocean, open_mouth, otonashi_kotori, outdoors, red_eyes, sitting, sky, smile, solo, swimsuit, yellow_bikini