naka ushiro, seia (blue archive), seia (swimsuit) (blue archive), blue archive, highres, 1girl, animal ear fluff, animal ears, blonde hair, blue sky, breasts, cloud, covered navel, cross halo, day, diamond cutout, fox ears, fox girl, fox tail, hair over one eye, halo, highleg, highleg one-piece swimsuit, horizon, jacket, long hair, looking at viewer, ocean, official alternate costume, official alternate hairstyle, one-piece swimsuit, orange-tinted eyewear, orange eyes, outdoors, side ponytail, sitting, sky, small breasts, solo, sunglasses, swimsuit, tail, tinted eyewear, visor cap, wariza, white one-piece swimsuit, yellow halo, yellow jacket, yellow visor