piisu, serika (blue archive), serika (swimsuit) (blue archive), blue archive, commentary, highres, 1girl, animal ear fluff, animal ears, barefoot, beach, bikini, black bikini, black hair, blue ribbon, blush, breasts, cat ears, cat girl, closed eyes, evening, extra ears, feet, fireworks, frilled bikini, frills, full body, hair ribbon, halo, halterneck, holding, holding fireworks, legs, long hair, ocean, off-shoulder bikini, off shoulder, official alternate costume, open mouth, outdoors, overexposure, red halo, ribbon, small breasts, solo, sparkler, squatting, sunset, swimsuit, toenails, toes, twintails, very long hair, wavy mouth