serika (blue archive), serika (swimsuit) (blue archive), blue archive, absurdres, commentary request, highres, 1girl, all fours, animal ear fluff, animal ears, bikini, bikini skirt, black bikini, black hair, cat ears, closed eyes, extra ears, frilled bikini, frills, halo, long hair, off-shoulder bikini, off shoulder, official alternate costume, pink halo, rokun, ruffle bikini, simple background, solo, swimsuit, twintails, white background