haruyama kazunori, pipi (umi no triton), umi no triton, lowres, 1970s (style), 1girl, air bubble, blue eyes, blush, brown hair, bubble, completely nude, female focus, fins, fish tail, flat chest, gem, hair ornament, loli, looking at viewer, mermaid, monster girl, nipples, nude, ocean, oldschool, open mouth, orange hair, pearl (gemstone), purple tail, retro artstyle, short hair, small areolae, small nipples, smile, solo, star (symbol), tail, underwater