A Japanese stationery manufacturer known for its beautifully crafted paper goods featuring foil stamping, intricate detailing, and nostalgic illustrations. The company collaborates with renowned artists and illustrators to create postcards, stickers, and letter sets that combine traditional printing techniques with refined, storybook-inspired design. SEAL-DO is especially recognized for its luxurious foil finishes and collectible series that celebrate classic fairy tales and timeless themes.