2girls, a-chan_(hololive), ahoge, amagai_tarou, bikini, black_bikini, breasts, from_below, frown, half_updo, halterneck, harusaki_nodoka, hololive, medium_breasts, multi-strapped_bikini, multiple_girls, navel, outdoors, parasol, side-tie_bikini_bottom, small_breasts, string_bikini, swimsuit, tube, umbrella, virtual_youtuber, water_drop, white_bikini