blanketrena, sussurro (arknights), sussurro (summer flower) (arknights), arknights, highres, 1girl, ahoge, bikini, black bikini, blue sky, blush, cloud, cloudy sky, cowboy shot, day, flat chest, grey hair, hair ornament, hairclip, holding, holding swim ring, hot, innertube, jitome, low twintails, material growth, official alternate costume, oripathy lesion (arknights), outdoors, raised inner eyebrows, red eyes, short hair, short twintails, sky, solo, sun, swim ring, swimsuit, twintails, wading, water, wavy mouth, wet