chiyingzai, kei (blue archive), kei (student) (blue archive), blue archive, commentary request, highres, 1girl, alternate costume, armpits, arms up, bikini, black hairband, blush, breasts, constellation, hair between eyes, hairband, knees up, long hair, long hair between eyes, looking at viewer, lying, navel, night, outdoors, pink bikini, pink eyes, short shorts, shorts, small breasts, solo, swimsuit, very long hair, white hair