ONE BY KOSÉ Melano Shot W Limited Kit Regular size (40ml) Includes Melano Shot W Mask (1 sheet) Retail price: 5,830 yen A medicated whitening serum that uses kojic acid to "decolorize the source of spots*." It directly targets the source of spots, "decolorizes the source of spots*," fundamentally prevents melanin production, and maintains skin that is clear and radiant, without even a hint of spots.