mame, boku no himitsu taiken, game cg, variant set, 1990s (style), 1girl, bare shoulders, black background, bow, breasts, cleavage, closed mouth, collarbone, curtained hair, hair bow, hand on own chest, large breasts, long hair, looking at viewer, low twintails, nipples, nonaka yoshiko (boku no himitsu taiken), nude, parted bangs, pink bow, purple eyes, purple hair, retro artstyle, simple background, smile, solo, tachi-e, tareme, twintails, upper body, very long hair