stellated icosahedron, yuuka (blue archive), blue archive, commentary, highres, 1girl, alternate costume, arm on own stomach, bare shoulders, blue eyes, blurry, blurry background, blush, bow, bow bra, bow panties, bra, breasts, closed mouth, collarbone, halo, indoors, light smile, long hair, looking at viewer, mechanical halo, navel, panties, purple bra, purple eyes, purple hair, purple panties, skindentation, solo, stomach, two side up, underwear