keyan art, kayoko (blue archive), blue archive, commentary, highres, 1girl, alternate costume, arm support, backlighting, bare arms, bikini, black bikini, black choker, black hair, black horns, blue sky, breasts, choker, cleavage, clenched hand, closed mouth, collarbone, demon girl, demon horns, double-parted bangs, earclip, grey halo, hair between eyes, halo, hand on own cheek, hand on own face, hand up, horns, long hair, medium breasts, multicolored hair, ocean, outdoors, pink sky, ponytail, red eyes, sidelocks, sky, smile, solo, split mouth, straight hair, swimsuit, tsurime, twilight, two-tone hair, upper body, white hair