1girl, ball, beach_towel, beachball, bikini, blush, breasts, earrings, gold_earrings, gold_necklace, heart, heart_necklace, heterochromia, hololive, houshou_marine, houshou_marine_(summer), jewelry, large_breasts, long_hair, looking_at_viewer, lying, navel, necklace, official_alternate_costume, on_back, oniku_(o29sukizero), red_bikini, red_eyes, red_hair, sand, smile, solo, swimsuit, towel, untied_bikini, virtual_youtuber, yellow_eyes