gu meng yin, ui (blue archive), blue archive, absurdres, commentary request, highres, 1girl, bikini, black bikini, black hair, black sweater, blush, book, breasts, brown halo, clothes pull, covered erect nipples, crossed bangs, embarrassed, groin, hairband, halo, holding, holding book, long hair, looking down, navel, small breasts, solo, sweater, sweater pull, swimsuit, thighs, turtleneck, turtleneck sweater