popqn, mashiro (blue archive), mashiro (swimsuit) (blue archive), blue archive, game asset, large variant set, official art, third-party source, variant set, 1girl, :<, arm support, ball, bare shoulders, beach towel, beachball, bikini, black bikini, black choker, black hair, black sandals, blush, bob cut, book, bottle, bucket, can, choker, closed mouth, collarbone, cooler, double-parted bangs, drawstring, drink can, expressionless, feet, female focus, flat chest, frilled bikini, frills, from above, full body, hairband, halo, halterneck, hand up, holding food, holding popsicle, jacket, legs, long sleeves, looking at viewer, lying, navel, off shoulder, on side, open clothes, open jacket, pink jacket, popsicle, purple eyes, red halo, sand, sandals, short hair, sidelocks, soda can, solo, spade, stomach, swimsuit, tachi-e, thighs, towel, transparent background, white hairband