1girl, ahoge, arm_up, azur_lane, bikini, breasts, cleavage, large_breasts, looking_at_viewer, multi-strapped_bikini, o-ring, o-ring_bikini, official_alternate_costume, red_hair, shallow_water, side_ponytail, sitting, solo, swimsuit, tsuri_pi, wariza, water, zara_(azur_lane), zara_(poolside_coincidence)_(azur_lane)