Emily, Selena and Jackie - famous with their 50 thousand YouTube fans since the 3 Tails - attract their travel. As girls find it difficult to comprehend the significance of their gift, protecting their secret fans for over five years have enchanted. Even their parents have no idea they have the capacity to transform in to mermaids. At Step 3 Tails: A Mermaid Adventure, their lifestyles are threatened after a stranger learns of their abilities and kidnaps one of those girls so as to exploit her DNA. During a perilous sea rescue assignment, they detect that mermaids aren't the only endangered species from the ocean.