1girl, d, adapted_costume, aqua_eyes, arimoto_wataru, ball, beachball, bikini, blonde_hair, chest_sarashi, glowing, hair_between_eyes, hair_ribbon, hairband, holding, hololive, kazama_iroha, kazama_iroha_(1st_costume), looking_at_viewer, looking_to_the_side, night, open_mouth, panty_straps, partially_submerged, ponytail, ribbon, sarashi, smile, solo, swimsuit, virtual_youtuber, water