A vibrant, spiral-bound interactive water-reveal activity book titled 'Magic Water Book: 海底世界 (Underwater World)', designed for young children. Features colorful cartoon-style marine life including a shark, seahorse, octopus, crab, clownfish, and coral reefs on each page. The book uses special water-reactive ink—when brushed with the included water pen (green cap, white body with playful sea creature illustrations), hidden images magically appear, then fade as pages dry, enabling repeated use. Made of thick, durable cardstock with rounded corners for safety; blue plastic cover and black spiral binding ensure longevity. Ideal for developing fine motor skills, color recognition, and ocean-themed learning in a mess-free, eco-friendly way. Perfect for travel, quiet time, or educational play at home or daycare. Includes one refillable water pen (labeled '送' meaning 'free gift') and stands upright on a decorative wave-patterned display base. Not a fashion product but an educational toy/book for kids aged 2–6.