1girl, bad_pixiv_id, bare_legs, bare_shoulders, bikini, black_bikini, black_eyes, blonde_hair, blush, braid, breasts, chilli_646, cleavage, closed_mouth, collarbone, cup, eyewear_on_head, feet_out_of_frame, girls'_frontline, holding, holding_cup, legs, lifebuoy, long_hair, looking_at_viewer, lying, medium_breasts, navel, ocean, official_alternate_costume, serdyukov_(crow_lifeguard)_(girls'_frontline), serdyukov_(girls'_frontline), sitting, smile, solo, sunglasses, swimsuit, twin_braids, water