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